When I installed my rear carb kit...I pulled the cyl off & checked the ring. I believe the ring in my engine does not need too be that hard. Hey I do not know, but a hard ring with a lot of tension may wear the sleeve. The Boman ring would break in & seal much faster & as a side benifit...be more kind to the sleeve. I wish I new some person that had a piston & sleeve to sen to Frank. He does not have a master ring yet for the DLE30. Capt,n PS PM ME if you can.