The idea is awesome and they should work great. I wasn't overly impressed with the fact that they claim they are 1/4" thick, but they are actually 3/16". The width is also very variable. Some of them are 3 3/8 wide and some are 3 5/8 wide. No. 3 1/2 as described. None of this would be terrible, but I've already done the milling to the size described. The appropriate screws are special housing screws from fastcap, which you will not find in hardware stores. It would be nice if they told you about them so you can buy them together. You need two sizes and you can only get them in a box of 100. A little frustrating but since they are hidden they should work fine once installed to get rid of the protrusions.
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