Hi XXXXXXXXXXXX;
What is the model number of your unit, please?
Ok thank you.
I will look this up and get right back to you.
Im sorry but I am unable to find a service manual for your unit.
However I did locate a website with the parts breakdown of your unit. Click here to view that page.
What I do not understand is what you mean by "the kind you put an insert into to start". What insert are you talking about? Is it the sink stopper that activates the unit (item #1 in the breakdown)?
If so then you need a new switch (item #16).
To order the part click here.
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Best regards; The Home Smithy
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Jack of all trades Master of a few.
#1 Home Improvement Expert. Over 30 years experience in construction, and home repairs
Were you able to remove the stopper?
Ok flora;
What you need to do is replace the switch on the side of your disposal. It is item number 16 in this diagram.
What has happened is the knife that was left in the unit hit the switch and damaged it so that the stopper would no longer turn it off.
If you are not mechanicly inclined then any handyperson should have no problem replacing the switch for you for a reasonable fee.