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Please you, but it might be worth a check anyway just to be sure. In any event I would do as Jamie illustrated, pre drill at the roughed out stage before any final shaping/contouring is done. Seems...

Does that mean that the tangs are bent? If they are bent I doubt that you are creating the problem. OTH if the blades are straight then yes you may have a problem.

Bob

Yea, I would check for bent tangs on the ones you are having trouble with. IIRC there are work arounds involving using different washer set ups to compensate for that if that is the problem. You can...