Stuck Lid

Welcome to the forum. You'll get more response if you post in the proper subforum. There's a rock tumbling one. This is for technical forum issues.
Does your tumbler have to lids? Use the washer to pry off the outside stainless steel lid and then flex the top side of the barrel where the rubber lid is. Grab the top edge of the barrel and bend it away from the rubber lid to try to "break the seal" Sometimes I have to do this in a few places around the barrel before the lid will come loose. Good luck!






Forgot to hit the post button and then uploaded without realizing that Chuck replied.

I have the Platinum National Geographic tumbler. The barrel and outer cover are rubber. Inside is another cover that is a rubber diaphram. Then a ring goes over that and fits into slots.
I think some of the slurry leaked into the threads that are on the outer rubber cover and it has solidified. I have tried to find another tumbler for this and having no luck. Does anyone think the barrel with the metal lid will work for the Platinum NG Tumbler?

Solid advice might be hard to come by. I had to look that tumbler up and had never seen that barrel design before. Can't think of anyone off hand that has that exact one.







Chuck

In addition to the soaking in soapy water that was mentioned you could firmly tap on the edge of the lid with a small hammer or similar tool and go all around the outside. I have loosened jar lids that way a number of times.

If you get that lid loosened up and off, this is something I’d consider doing as well. I think you’d have to grease the threads like this often, maybe each time you closed/sealed it up at the start of every new step. 

We have that same tumbler. Most definitely you have slurry in the treads. Happens every time. We use petroleum jelly on the treads and it has solved that problem. You may also be tightening the lid too much. We have found that the tighter it is, the more it leaks. I have always been able to open it by hand, but before using the petroleum jelly, it was pretty much at my strength limits. I have heard that turning it upside down and clamping the hand grip of the lid in a bench vise will allow you to use 2 hands to loosen it. Obviously you will want to release it and turn it upright after it breaks free. I have never tried it so don't know if it will damage the lid at all.

Most plastics have a fairly high thermal expansion rate, in other words they grow quite bit as temperature increases, and shrink as it gets colder. You might try dipping the barrel right up to, but not including the lid in cold water, colder the better but not freezing. Let it soak in that for say half an hour then turn the barrel over and dip only the lid in hot water, at least tap water hot. The lid might expand enough to loosen.