diff --git a/js/custom.js b/js/custom.js
index e2b33d5..a70caf5 100644
--- a/js/custom.js
+++ b/js/custom.js
@@ -30,7 +30,11 @@ function encodeCustom(custom, verbose) {
             if (rolledIDs.includes(id)) {
                 let val_min = custom.get("minRolls").has(id) ? custom.get("minRolls").get(id) : 0;
                 let val_max = custom.get("maxRolls").has(id) ? custom.get("maxRolls").get(id) : 0;
-                let sign = (Boolean(val_min / Math.abs(val_min) < 0) | 0) + 2*(Boolean(val_max / Math.abs(val_max) < 0) | 0) // 0 - both pos 1 - min neg max pos 2 - min pos max neg (how?) 3 - min neg max neg 
+                // 0 - both pos
+                // 1 - min neg max pos
+                // 2 - min pos max neg (how?)
+                // 3 - min neg max neg
+                let sign = (Boolean(val_min / Math.abs(val_min) < 0) | 0) + 2*(Boolean(val_max / Math.abs(val_max) < 0) | 0);
                 //console.log(id + ": " + sign);
                 let min_len = Math.max(1,Math.ceil(log(64,Math.abs(val_min)+1)));
                 let max_len = Math.max(1,Math.ceil(log(64,Math.abs(val_max)+1)));
@@ -38,9 +42,7 @@ function encodeCustom(custom, verbose) {
                 val_min = Math.abs(val_min);
                 val_max = Math.abs(val_max);
 
-
                 if ( val_min != 0 || val_max != 0 ) {
-                    //hash += Base64.fromIntN(i,2) + Base64.fromIntN(val_min,Math.max(1,Math.ceil(log(64,Math.abs(val_min))))) + ":" + Base64.fromIntN(val_max,Math.max(1,Math.ceil(log(64,Math.abs(val_min))))) + "_";
                     if (custom.get("fixID")) {
                         hash += Base64.fromIntN(i,2) + Base64.fromIntN(len,2) + sign + Base64.fromIntN(val_min, len);
                     } else {
diff --git a/js/display.js b/js/display.js
index 02c4bea..7be7bc3 100644
--- a/js/display.js
+++ b/js/display.js
@@ -1,5 +1,6 @@
 /**
  * Apply armor powdering.
+ * Applies twice for crafted items because wynn.
  * Also for jeweling for crafted items.
  */
 function applyArmorPowders(expandedItem, powders) {
@@ -8,32 +9,42 @@ function applyArmorPowders(expandedItem, powders) {
         applyArmorPowdersOnce(expandedItem, powders);
     }
 }
+
+/**
+ * Apply armor powders once only.
+ * Encoding shortcut assumes that all powders give +def to one element
+ * and -def to the element "behind" it in cycle ETWFA, which is true
+ * as of now and unlikely to change in the near future.
+ */
 function applyArmorPowdersOnce(expandedItem, powders) {
     for(const id of powders){
         let powder = powderStats[id];
-        let name = powderNames.get(id);
-        expandedItem.set(name.charAt(0) + "Def", (expandedItem.get(name.charAt(0)+"Def") || 0) + powder["defPlus"]);
-        expandedItem.set(skp_elements[(skp_elements.indexOf(name.charAt(0)) + 4 )% 5] + "Def", (expandedItem.get(skp_elements[(skp_elements.indexOf(name.charAt(0)) + 4 )% 5]+"Def") || 0) - powder["defMinus"]);
+        let name = powderNames.get(id).charAt(0);
+        let prevName = skp_elements[(skp_elements.indexOf(name) + 4 )% 5];
+        expandedItem.set(name+"Def", (expandedItem.get(name+"Def") || 0) + powder["defPlus"]);
+        expandedItem.set(prevName+"Def", (expandedItem.get(prevName+"Def") || 0) - powder["defMinus"]);
     }
 }
 
+/**
+ * Take an item with id list and turn it into a set of minrolls and maxrolls.
+ * Also applies powders to armor.
+ */
 function expandItem(item, powders) {
     let minRolls = new Map();
     let maxRolls = new Map();
     let expandedItem = new Map();
-    if(item.fixID){ //The item has fixed IDs.
+    if (item.fixID) { //The item has fixed IDs.
         expandedItem.set("fixID",true);
-        for (const id of rolledIDs){ //all rolled IDs are numerical
+        for (const id of rolledIDs) { //all rolled IDs are numerical
             let val = (item[id] || 0);
-            //if(item[id]) {
-                minRolls.set(id,val);
-                maxRolls.set(id,val);
-            //}
+            minRolls.set(id,val);
+            maxRolls.set(id,val);
         }
-    }else{ //The item does not have fixed IDs.
-        for (const id of rolledIDs){
+    } else { //The item does not have fixed IDs.
+        for (const id of rolledIDs) {
             let val = (item[id] || 0);
-            if(val > 0){ // positive rolled IDs                   
+            if (val > 0) { // positive rolled IDs
                 if (reversedIDs.includes(id)) {
                     maxRolls.set(id,idRound(val*0.3));
                     minRolls.set(id,idRound(val*1.3));
@@ -41,28 +52,25 @@ function expandItem(item, powders) {
                     maxRolls.set(id,idRound(val*1.3));
                     minRolls.set(id,idRound(val*0.3));
                 }
-            }else if(val < 0){ //negative rolled IDs
+            } else if (val <= 0) { //negative rolled IDs
                 if (reversedIDs.includes(id)) {
                     maxRolls.set(id,idRound(val*1.3));
                     minRolls.set(id,idRound(val*0.7));
                 }
                 else {
-                    minRolls.set(id,idRound(val*1.3));
                     maxRolls.set(id,idRound(val*0.7));
+                    minRolls.set(id,idRound(val*1.3));
                 }
-            }else{//Id = 0
-                minRolls.set(id,0);
-                maxRolls.set(id,0);
             }
         }
     }
-    for (const id of nonRolledIDs){
+    for (const id of nonRolledIDs) {
         expandedItem.set(id,item[id]);
     }
     expandedItem.set("minRolls",minRolls);
     expandedItem.set("maxRolls",maxRolls);
     expandedItem.set("powders", powders);
-    if(item.category === "armor") {
+    if (item.category === "armor") {
         applyArmorPowders(expandedItem, powders);
     }
     return expandedItem;
diff --git a/js/load.js b/js/load.js
index 87cf05f..043273b 100644
--- a/js/load.js
+++ b/js/load.js
@@ -53,7 +53,11 @@ async function load_local(init_func) {
 }
 
 /*
- * Clean bad item data. For now just assigns display name if it isn't already assigned.
+ * Clean bad item data.
+ * Assigns `displayName` to equal `name` if it is undefined.
+ * String values default to empty string.
+ * Numeric values default to 0.
+ * Major ID defaults to empty list.
  */
 function clean_item(item) {
     if (item.remapID === undefined) {
@@ -68,9 +72,6 @@ function clean_item(item) {
             if (item.skillpoints[i] === undefined) { item.skillpoints[i] = 0; }
             if (item.skillpoints[i] < 0) { item.has_negstat = true; }
         }
-        if (item.slots === undefined) {
-            item.slots = 0
-        }
         for (let key of item_fields) {
             if (item[key] === undefined) {
                 if (key in str_item_fields) {