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

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.