I used to make a few zero gap inserts, but if you've done it before you know how excruciating it can be to get everything perfectly lined up. I saw this and decided to give it a try. Unfortunately thin plastic. Spring. thin plastic. It doesn't get any better if you loosen the supports by cutting through a couple of them to make a slot for the blade. I will say it will probably be good for cutting large pieces that don't depend on the split plate. to provide a base for the part to be cut out, but who uses a zero clearance insert for large parts? Oh and YES, I adjusted all four screws and they did a great job strengthening the corners and setting the height perfectly flush with the table. at the corners. There were too many corners in the middle that I can't change. Due to the price and the fact that I'm just too lazy to find a place to send them back, I just threw them (I bought two) in the trash. Skip everything and just make your own or maybe try a different brand?
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