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When you are using a zci does it HAVE to be screwed down while using? I know this would be okay if it was under the fence like when you are raising the blade into it, but what I'm wondering about is while using the saw to make other cuts. Is it safe or okay to just have it sitting in the opening?

Second question: I am getting a table saw from father in law, mid 90's model. Craftsman contractor and the insert can only go about 1/4" deep from the table top. Is this still something that can accept a zci? Does it need to be deeper in order to use one? If it is okay at that depth what material is suggested to get so thin?

Thanks!
 

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I have what is probably the same saw. I made some inserts using birch plywood. The work fine and I don't attach them in any way.
 

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With a screw I attach a small flat washer to the underside of my inserts such that the edge of the washer protrudes about 1/16 to 1/8 inch from the bottom back edge of the insert. The washer edge then slips under the bottom of the table when the insert is put into place. This helps hold the insert down in the event the insert hangs up on the blade for some reason and tries to kick back. I never have had an insert try to kick back, but the washer adds a measure of safety when and if the unexpected arrives. Depending on the design of the table this might or might not work with your saw, but you might want to look into it as a possibility.
 
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