<<< To put the new one on - I start one end down the side and more or less thread the ring around the piston and it snaps in place. <<<

I think what Jim is saying is do NOT try to expand the ring and bring it down over the piston all at once - it might break. The ring will be at an angle and one end will go into the groove first before bringing the rest of the ring down and in. This method does not force the ring to stretch as much while getting it into the groove.

Thanks,

Ernie Misner