Wear and tear is expected, however making small turns(adjustments) are easier on the o ring. Big turns(adjustments) eventually ends up in the washing machine effect (left, right left, right).
Of course change the oring.
I have used the fioroni with even the stock engine mount and it works fine just make sure as stated in the earlier post that is is not binding anywhere. What collet are you using
:iamfrddyj::nutshot::lmao3:. Good one. Its ok Fred to enjoy it when it is new but your finger will get itchy to run it. I like to see the videos whenever possible.