It probably is a threading issue. I think they are threaded left to right - not the other way around. You should be able to find a manual online to double check. I would try that, then re-try the machine if possible. Even at $240 and no repair it's more than I would spend for one, but I'm really cheap. Haven't paid more than $50 for any vintage machine yet. I have an electrified 66 Redeye, a FW and a 99 in a very nice table. Good luck.