i use the harbor freight portaband with the swag table for a lot of things. I haven't messed with the speed control yet, and always run it at full speed, or at least i though it was full speed, i wanted to try it at different speeds just to see how it performs, I adjusted the dial today and the speed stays the same from 1 to 7. No change, im wondering what could cause the speed switch to fail, capacitor? I have a router speed control i can use with it, but id rather figure out what's going on, the trigger is just an on/off click and isnt pressure sensitive like some of the more expensive brands. Any thought? Thanks