If the stihl dealer is charging list price the 11290302002 piston is $24 or $16 farmertec piston plus $6 each for caber rings.It certainly does justify buying a cheap one if he is not sure how it will work out with the scored cyl. Why wreck a 35.00 piston in checking if it will work out ? Once he sees it has good compression and it runs fine then if you are so inclined put a better one in. I think you will find the Farmertech with Caber rings quite adequate.