I've a badly pitted 400F caliper piston, and a serviceable '750K2 piston. They're dimensionally the same (externally).... but the '400 piston has a blanking plate in its end....versus the open ended 750 part. The 'blanking' plate rattles, though is captured in some way that I haven't yet fathomed. That said, I don't think I can transfer it across due the 400 piston appears to have a thinner wall where this plate fits.
Any comments on whether I can use the K2 piston... and if I have to somehow mimic this blanking plate.
Cheers...