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"I got excited about Nanuq's mods and tried to open mine up recently to start some mods but it was a bear. Don't know if it got cross threaded or not. Will try to get it fixed." If the back is hard to get started, it can be a hassle to fix unless you can see where the threads are damaged...case or case back, and try to clean up the bad threads somehow. Not an easy task. If the back has seized and you can get it off, you have a better shot at repairing it with polishing paste. If the back starts Ok and tightens up after a half turn or so, you can sometimes slick the threads up with Simichrome, Wenol etc. polishing paste. Gob some on the threads and run the case back in and out over and over while checking to see if it goes on any easier and deeper down in the case. I use a 'sticky ball' for this and the 'official' type case back tool is not used because they tend to slip and besides, you sometimes need to press down pretty hard to make the case back turn and that can make matters worse. I have also used fine grit automotive valve grinding compound on rough threads to smooth them out but as soon as a little bit of progress is made, it is a good idea to go to polishing paste of some sort because most VGC has diamond dust in it and can cut pretty fast. This also works on sticky rotating bezels, just be sure to clean it all off or it will keep grinding from now on.

Faded insert and vintage pearl , crappy Perfect clones bracelet with the line

My work in progress with UAE ministry of defence dial.