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Thats neat. I'm interested in the technique for some future work. Can you elaborate a bit on materials & lapping compound?
Excellent thanks. I also noticed the slot phasing of your aluminum lap shown in the pic with the die holder - an open through-cut so it can contract; 2 external slots, phased equally apart. And the pinch grub screws occur on either side of the through-slot. Is this the general layout principle? I guess to facilitate uniform ID reduction as its adjusted through lapping?Can you elaborate on the clearance dimensions. For example, if the piston was 0.500" target finish diameter, then the lap ID would be bored to ???.About how many times would you make a tightening tweak?