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I don't always need to make permanent jigs or adaptions to my table saw, sometimes I only need something for a one-time cut. There are many ways of making adaptions so that think wedges of wood will not fall through or get caught between the blade and the insert. One way, if you have a fence suitable is to find yourself an very thin, like 1/8th thick plywood off-cut and slide it under the fence and lock the fence. This will prevent the plywood from moving. Now you can wind the table saw blade up through the plywood and now instantly have adapted a zero clearance insert ... but on TOP of you existing insert.
Watch it on Youtube: https://youtu.be/VcodNMiNNac
Now you can run the wood through that you want. In order for this to work, you need to know where to position the fence so you will need to mark or adapt it, but there is also another way, similar, but more adaptable especially for those who don't have bigger cabinet type saws ...