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What is the best way to swap bolt rollers in mg42? Have two bolts that I want to swap rollers on.

Thanks

pop the old rollers out with a center punch by clamping the bolt head in a vise with wood jaws, and placing the center punch in the hole behind the roller. Hit the center punch with a hammer, the roller goes flying. Eye protection is recommended.

Use the same vise with wood jaws to squeeze in the new rollers. Sounds like you're about due for the MG42 repair manual.

Just wanted to note that the rollers from RTG are not new. I has ASSumed they were and then saw the dings on them when the oil was wiped off. When I looked at the description again it does not say anything about condition. Does anybody have new rollers out there?