diff --git a/migrations/20140831_increase_gems_for_previous_contributions.js b/migrations/20140831_increase_gems_for_previous_contributions.js
index b8e30691ae..081da935c4 100644
--- a/migrations/20140831_increase_gems_for_previous_contributions.js
+++ b/migrations/20140831_increase_gems_for_previous_contributions.js
@@ -1,15 +1,16 @@
 // IMPORTANT:
 //
 // run like this to capture all output:
+//
 // node 20140831_increase_gems_for_previous_contributions.js  > 20140831_increase_gems_for_previous_contributions_output.txt
 
 
 var migrationName = '20140831_increase_gems_for_previous_contributions';
-// author: Alys (d904bd62-da08-416b-a816-ba797c9ee265)
 
 /**
  * https://github.com/HabitRPG/habitrpg/issues/3933
  * Increase Number of Gems for Contributors
+ * author: Alys (d904bd62-da08-416b-a816-ba797c9ee265)
  * 
  * Increase everyone's gems per their contribution level.
  * Originally they were given 2 gems per tier.
@@ -30,50 +31,102 @@ var mongo = require('mongoskin');
 var _ = require('lodash');
 
 
-///////////////////    UNCOMMENT *ONE* OF THESE LINES:    ///////////////////
-// var dbUsers = mongo.db('lefnire:mAdn3s5s@charlotte.mongohq.com:10015/habitrpg_large?auto_reconnect').collection('users');   // @lefnire production?
-// var dbUsers = mongo.db('localhost:27017/habitrpg_old?auto_reconnect').collection('users');   // @lefnire habitrpg_old
-// var dbUsers = mongo.db('localhost:27017/habitrpg?auto_reconnect').collection('users');   // for local testing by script author (e.g., vagrant install)
+///////////////////    UNCOMMENT ONE OF THESE LINES:    ///////////////////
+// var dbUsers = mongo.db('lefnire:mAdn3s5s@charlotte.mongohq.com:10015/habitrpg_large?auto_reconnect').collection('users'); // @lefnire habitrpg_large
+// var dbUsers = mongo.db('localhost:27017/habitrpg_old?auto_reconnect').collection('users'); // @lefnire habitrpg_old
+// var dbUsers = mongo.db('localhost:27017/habitrpg?auto_reconnect').collection('users'); // for local testing by script author (e.g., vagrant install)
+if (typeof dbUsers == 'undefined') { exiting(1, 'Uncomment one of the "var dbUsers" lines!'); }
 
 
+var query = { $and: [
+    { 'migration': {$ne: migrationName} },
+    { 'contributor.level': {$gt: 0} },
+    { 'contributor.level': {$lt: 9} }
+]};
+
 var fields = {'migration':1,
     'contributor.level':1,
     'auth.local.username':1,
     'balance':1,
-    };
+};
 
-dbUsers.findEach({ $and: [
-  { 'contributor.level': {$gt:0} },
-  { 'contributor.level': {$lt:9} }
-]}, fields, {batchSize:250}, function(err, user){
-    if (!user) err = '!user';
-    if (err) {return console.error(err);}
+var userResults = {}; // each key is a UUID, each value is a string
+                      // describing what changed for that user
+
+console.warn('Updating users...');
+var progressCount = 50;
+var count = 0;
+dbUsers.findEach(query, fields, {batchSize:250}, function(err, user) {
+    if (err) { return exiting(1, 'ERROR! ' + err); }
+    if (!user) {
+        console.warn('All users found. Fetching final balances...');
+        return fetchFinalBalances();
+    }
+    count++;
 
     var set = {'migration': migrationName};
 
     var tier = user.contributor.level;
     var extraGems = tier; // tiers 1,2,3
-    if (tier > 3) {
-        extraGems = 3 + (tier - 3) * 2;
-    }
-    if (tier == 8) {
-        extraGems = 11; // mods (tier 8) are tier 7 in terms of gems awarded
-    }
+    if (tier > 3)  { extraGems = 3 + (tier - 3) * 2; }
+    if (tier == 8) { extraGems = 11; }
     extraBalance = extraGems / 4;
     set['balance'] = user.balance + extraBalance;
 
-    // Display current state of user:
-    console.log("\n" + user._id + "  " + user.auth.local.username + ":\n" +
-        "  contrib tier          :  " + tier + "\n" +
-        "  balance before        :  " + user.balance + "\n" +
-        "  balance (gems) added  :  " + extraBalance + " (" +
-                                        extraGems + ")" + "\n" +
-        "  expected balance after:  " + (user.balance + extraBalance));
-
-    //console.log(JSON.stringify(user, null, "  "));
-    //console.log("set: "   + JSON.stringify(set,   null, "  "));
+    // Capture current state of user:
+    userResults[user._id] =
+        user._id + '  ' + user.auth.local.username + ':\n' +
+        '  contrib tier          :  ' + tier + '\n' +
+        '  balance before        :  ' + user.balance + '\n' +
+        '  balance (gems) added  :  ' + extraBalance + ' (' +
+                                        extraGems + ')' + '\n' +
+        '  expected balance after:  ' + (user.balance + extraBalance) + '\n';
 
+    // Update user:
     dbUsers.update({_id:user._id}, {$set:set, $inc:{_v:1}});
-
-    // No progress counter because we print output for every user.
+    if (count%progressCount == 0) console.warn(count + ' ' + user._id);
 });
+
+
+function fetchFinalBalances() {
+    var query = {_id: {$in: Object.keys(userResults)}};
+    var fields = {
+        'auth.local.username':1,
+        'balance':1,
+    };
+
+    var count1 = 0;
+    dbUsers.findEach(query, fields, {batchSize:250}, function(err, user) {
+        if (err) { return exiting(1, 'ERROR! ' + err); }
+        if (!user) {
+            console.warn('All final balances found.');
+            return displayData();
+        }
+        count1++;
+        userResults[user._id] = userResults[user._id] +
+            user._id + '  ' + user.auth.local.username + ':\n' +
+            '  actual balance after  :  ' + user.balance + '\n';
+        if (count1%progressCount == 0) console.warn(count1 + ' ' + user._id);
+    });
+}
+
+
+function displayData() {
+    _.each(userResults, function(text, uuid) {
+        console.log(text); // text contains uuid
+    });
+    console.log('\n' + count +
+            ' users processed (should be roughly 335 according to the Hall)\n');
+    return exiting(0);
+}
+
+
+function exiting(code, msg) {
+    code = code || 0; // 0 = success
+    if (code && !msg) { msg = 'ERROR!'; }
+    if (msg) {
+        if (code) { console.error(msg); }
+        else      { console.log(  msg); }
+    }
+    process.exit(code);
+}
diff --git a/migrations/20140831_increase_gems_for_previous_contributions_FINAL_CHECK.js b/migrations/20140831_increase_gems_for_previous_contributions_FINAL_CHECK.js
deleted file mode 100644
index d11e1b29fc..0000000000
--- a/migrations/20140831_increase_gems_for_previous_contributions_FINAL_CHECK.js
+++ /dev/null
@@ -1,43 +0,0 @@
-// IMPORTANT:
-//
-// run like this to capture all output:
-// node 20140831_increase_gems_for_previous_contributions_FINAL_CHECK.js  > 20140831_increase_gems_for_previous_contributions_FINAL_CHECK_output.txt
-
-
-
-// 20140831_increase_gems_for_previous_contributions_FINAL_CHECK.js
-// author: Alys (d904bd62-da08-416b-a816-ba797c9ee265)
-
-/**
- * Run this script immediately after
- *   20140831_increase_gems_for_previous_contributions.js
- * to capture the actual gem balance in case we need it later for
- * handling complaints that the right number of gems weren't added.
- */
-
-var mongo = require('mongoskin');
-var _ = require('lodash');
-
-///////////////////    UNCOMMENT *ONE* OF THESE LINES:    ///////////////////
-// var dbUsers = mongo.db('lefnire:mAdn3s5s@charlotte.mongohq.com:10015/habitrpg_large?auto_reconnect').collection('users');   // @lefnire production?
-// var dbUsers = mongo.db('localhost:27017/habitrpg_old?auto_reconnect').collection('users');   // @lefnire habitrpg_old
-var dbUsers = mongo.db('localhost:27017/habitrpg?auto_reconnect').collection('users');   // for local testing by script author (e.g., vagrant install)
-
-
-var fields = {
-    'auth.local.username':1,
-    'balance':1,
-    };
-
-dbUsers.findEach({ $and: [
-  { 'contributor.level': {$gt:0} },
-  { 'contributor.level': {$lt:9} }
-]}, fields, {batchSize:250}, function(err, user){
-    if (!user) err = '!user';
-    if (err) {return console.error(err);}
-
-    console.log("\n" + user._id + "  " + user.auth.local.username + ":\n" +
-        "  actual balance after  :  " + user.balance);
-
-    // No progress counter because we print output for every user.
-});