I have a set of 68mm 4mil cubs cylinders looking to trade for serval cylinders. I got them directly from kevin. They have a lil over a cleanup port.. I just had them replated last april. They had to be decked .028 because the top was uneven. I just run a thick gasket but you can get your domes cut to match. The right cylinder had some mild pitting in the nikasil. I have been riding them like that since the last rebuild with no problems. i'm pretty sure they can be repaired on warranty i just never got around to it. even if not they rip just the way they are. Im letting them go because i mostly trail ride.
photo album here