diff --git a/DataStructures/data.py b/DataStructures/data.py
index 6908c7a4..ec95964e 100644
--- a/DataStructures/data.py
+++ b/DataStructures/data.py
@@ -33,8 +33,13 @@ class Data:
     customFirmwareVersion = None
     holeyFirmwareVersion = None
     controllerFirmwareVersion = 0
-
     '''
+    interpreter version
+    if using a compiler newer than 3.5, use the newer string format methods without %'s
+    '''
+    pythonVersion35 = False  
+    
+    '''l
     Version Updater
     '''
     lastChecked = -1
diff --git a/defaultwebcontrol.json b/defaultwebcontrol.json
index cb89a05e..ec87691c 100644
--- a/defaultwebcontrol.json
+++ b/defaultwebcontrol.json
@@ -121,20 +121,42 @@
         },
         {
             "default": "None",
-            "desc": "How should the spindle start and stop automatically based on gcode? Leave off for none, or set external servo control, or external relay control, active high or low.\ndefault setting: None",
+            "desc": "How should the spindle start and stop automatically based on gcode? Leave off for none, or set external servo control, or external relay control, active high or low.  Speed control uses pin 45 in 51.29 firmware\ndefault setting: None",
             "firmwareKey": 17,
             "key": "spindleAutomate",
             "options": [
                 "None",
                 "Servo",
                 "Relay_High",
-                "Relay_Low"
+                "Relay_Low",
+                "SPEED_CTRL_RELAY_HIGH",
+                "SPEED_CTRL_RELAY_LOW"
             ],
             "section": "Advanced Settings",
             "title": "Spindle Automation",
             "type": "options",
             "value": "None"
         },
+        {
+            "default": "None",
+            "desc": "Spindle start speed absolute minimum\ndefault setting: 4000",
+            "firmwareKey": 60,
+            "key": "spindleMin",
+            "section": "Advanced Settings",
+            "title": "Spindle Speed Minimum",
+            "type": "string",
+            "value": "4000"
+        },
+        {
+            "default": "None",
+            "desc": "Spindle maximum speed\ndefault setting: 24000",
+            "firmwareKey": 61,
+            "key": "spindleMax",
+            "section": "Advanced Settings",
+            "title": "Spindle Speed Maximum",
+            "type": "string",
+            "value": "24000"
+        },
         {
             "default": 800,
             "desc": "The maximum feedrate in mm/min that machine is capable of sustaining.  Setting this value too high will cause movements to start before the prior movement finishes.\ndefault setting: 800",