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#10
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I have found the OEM 5/16 square head plugs are not as hard as a modern Allen head plugs.
So I drilled them with a 1/8" bit almost all the way. Then finished it off with a .030-.040 drill bit. Some guys just drill a brass plug. But I am afraid to. If it strips out down in that hole you have a problem. Steel, I have drilled a hole, heated and shrunk them and they came out. One I had to cut out with a torch. |
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