Way cool!! Cutting that slot with a 4-1/2" angle grinder is way easier than a hack saw. If it goes oversize for the flat stock you use add a shim washer or two to make up the dfference. If you can't get a roll pin an ordinary flat head machine screw into a threaded hole will work. Another way is to do that if you don't have a tap is to use a rivet or even a nail with a countersink under the headless end and peen it out to fill the conical hole surface with a center punch.

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