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Countersinking the holes and using a countersunk socket head capscrew would be easier and/or redrill 3 new holes on the extension post to a very tight fit OR leave the existing 3 screws in place whilst redrilling 3 new holes at 120deg apart and drill and tap those holes, WITHOUT redrilling outside wall of the post, thereby providing NO clearance in the screw holes on the extension post
Best
JA
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