[How do I?] Make a mag drill variable speed

It may be a brush type, you might see removable brush holders or maybe not. If you see sparking thru the vent slots when it runs then it's brushed
-Mark
 
Those controlers are rated for 25amps. If you have one on hand I would give it a shot. At $6, not much to lose. Mike
 
I will pull the plate off today and see what type of room is in the control panel. A friend stop by yesterday and I explained what I was gonna do. He said he had a variable speed model sitting around and he would exchange with me for awhile so I can get this job done I have coming up. I’ll keep you all updated
 
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