the good thing is i can set my top speed limit with the controller on the rotary tool so its like a set and forget, also i don't have to turn it off any more unless in changing bits since on my model you have to have the switch off to change a bit.
parts needed are.
1x singer or whatever brand sewing machine foot switch.
1x extension cord.
1x soldering iron.
1x roll solder.
2x 2in pieces of heat shrink.
wire cutters and screwdriver.
total cost was $4 dollars.
Step 1: Removing the Cables
Step 2: After Cutting Strip the Ends and Do the Same With Your Extension Cord.
i used a cheap torch to shrink my heat shrink.
Step 3: After All Is Together Test
Step 4: Enclosure Box
well i found a old chew can laying around, (use what you want) and i think it looks ok.
ps; im not a chewer.