Dremel MultiPro Model 395 Type5

Motor fails to run by itself. If I place the speed switch at setting 5 and then turn the chuck counter clockwise by hand, the motor runs at high speed. When I Iower the speed control to 4.3,2,1, the motor stops running. I thought it might be the brushes so I installed a new set of brushes. Dremel part # 90930-05. This has not solved the problem. The switch moves from 1 to 5 very smoothly without stopping at any settings between 1 and 5.

I normally use the Dremel on high speed. Any way to jump the switch so it only runs on high speed?