Insinkerator 17-55 Batch Garbage Disposal Switch Failure
 

This unit is very slow to shut off, as if the switch sticks.
An appliance parts website shows a kit with what appears
to be a microswitch. I expected that the switch would be
magnetic and sealed. Or is there a magnetically-activated
piston which activates the microswitch? A word about
theory would be very helpful to me.
Since nothing appears to be sealed, I would assume
the switch assembly might be repairable, perhaps by
cleaning??? The kit is over $40!
Help much appreciated!
Frank