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Got the rings loose but ended up breaking one of them…and while cleaning up the driveshaft tube I noticed a crack 3/4 of the way around the tube just above the top gearcase screws in the tube and the bolting area for the cav plate. Now that I’m this far into it I have a donner A-25 that I stole a piston ring from and now the driveshaft casing assembly. The odd thing is that the A-25 tube doesn’t have the upper screws going into the top of the aluminum gearcase housing…did they possibly find that you didn’t need them for the A-25 and up? Should I drill new holes like the old one? Someone has definitely been in this motor because one of the 1/4-20 bolts that hold the crankcase to the driveshaft casing was stripped and only holding by a couple of threads…heli coil time! Gosh…I hope the “surprises” stop coming at some point. Hope it runs good after all this work.