DenisS
Thatās interesting. I wonder that if the piston cants over due to the action of the springs the leading edge of the piston can dig in to the liner. Looking at the end of the piston the leading edge is chamfered but it looks sharp where the removal tool cutout meets the chamfer.
If the piston cants and that edge happens to be at the nearest point, could it dig in? Both are piston and liner are made of stainless so the liner will be marked, if the piston end was brass it would be too soft to mark the liner.
That is what is used to be known in the bike world as a āWhippitā; Someone writes of a potential problem on a part leading to people to go in the garage to whip it out to check theirs. Iāve just looked at mine, there is a very slight scoring of the liner at about the 11 o/clock position as you look at it. While I was at it I relieved the potentially sharp areas with a file (well, it canāt do any harm can it?) and have screwed the piston in tighter than I would normally do (luckily, I have a tool to do thatš ).
One more thing, just a thought, I noticed that the piston was far easier to file than I would have expected for stainless. Looking at the filed edges they look like they have a brass colour. Is it possible that our stainless pistons are actually made from plated brass?