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There are 2 basic types of drills you can use to drill through the frame. The normal type is the standard length. They will work but require a lot of pressure to shove them through. The stub length drills are much better for this. The tip is ground different and has 2 extra grinds so you aren’t shoving it through the medal. The tip actually cuts. Go on line or to a machine shop supply place and get some or let me know what size you need. I own a machine shop and have hundreds of both types. I will send you a few.
Lynwood
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