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I was thinking that an epoxied-in sleeve of tubing would be better. But a washer ought to be fine if it is a tight fit on the rod. That might be more easily obtainable with 1/16in. rod in washers...

I think the secret lies in the fact that the lighter the hammer, the more localised, close to the impact surface, the swelling of the pin will be. The logical extension is a ferry in the last 1mm. of...