My Frankfort Arsenal wet tumbler produces cleaned cases looking like brand new. I've noticed lately the end caps have been increasingly difficult to tighten for a seal. I e-mailed Battenfield Technologies for info to remedy this issue. After several back and forths with questions, I'm told since my unit was an earlier one so they'll send two caps and rubber seals. I'll report on this fix when I install the new parts. Very prompt replies and great resolution in my case.