give it a rest if it starts getting hot.
It does not have a trigger type speed control ,it has a preset speeds which you select by sliding a mechanical switch.Ah, so it already has a variable speed controller built in, and you're going to put it behind another. "Interesting", there are so many possibilities. At one extreme it'll just work, or they may interact in interesting ways, or at the very worst (though my gut feeling says not very likely) you let the smoke out of one of them.
Putting the tool on max speed won't take it's controller out of the equation - unless it has a mechanical switch that bypasses the speed control altogether, and I've never seen that in a tool.
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