Ouch
That walked out of the grooves they dont look beat up just the side of the piston .
Is this a polini quality control issue ?
I usually use the g clips (I can never get the c clips to Install confidently)
The Horseshoe clips that polini sends are the easiest to put in .
Some guys say put the hardest ones in you can find so they are hard to get out .
I turn them so that the opening is up like this "u" so the open end is up towards the top of the piston .
Others install it so the open end is down
When I feel they are in in rotate them 360 degrees with a pick to make sure they are in the groove and then turn them to position .
If you are done with Polini
And your Polini head is okay .
Athena Sports Alumunim cylinders work really well with the Polini Head .
It tightens the squish right up .
It improves the cylinder and makes it a copy of the Stage 6 MK1 that was very popular.