I have a Model 395. While the switch on mine works, it's not a good design from the aspect of usability. Integrating the on/off function with the speed control means one has to reset the speed every time the tool is turned on. Separate controls would make far more sense. I leave the speed control set to the value I use most often and control on/off with a separate switch like this one...
https://www.amazon.com/QVS-PA-1P-Sin...%2Bswitch&th=1
Since the tool is plugged into a powerstrip on the front of my bench, this switch is very conveniently placed for me.
You might want to consider a similar arrangement. The less the onboard switch is used, the longer it will last, which might account for why mine is still working.
Another possibility is to wire around the switch, effectively removing it from the circuit, leaving the tool in the "on at full speed" setting and using a router speed control to control on/off and speed.
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