I don't understand what you mean about using a "set screw and a retention screw". Unless you're erroneously calling the threaded insert a "set screw", which it is not.
You can't use those threaded inserts on a blade holder, they are too long, the threads in them are too far apart and the blade holder isn't thick enough. Where Jay-gon uses them they are going through 2 pieces of PVC. I don't even know if they would cut their own threads into aluminum or not.
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