Cold traps (CO2 or N2(l)) are always a good idea, but you know that. Yeah, most people don’t care enough about their vacuum pumps before they break. I’m assuming you’ve removed the belt(s), unbolted the vacuum module from the base, and removed the outer oil casing, is this correct? Have you taken the module apart yet? Note that in some vacuum pump designs, the shaft is mated to one of the the rotors at the factory and shouldn’t necessarily come off unless there’s a problem with the shaft or the rotor it’s attached to. What exactly is the shaft stuck in? What parts are we talking about when you say “we got off most of the parts?” I’ll probably be able to help if you can describe the situation as it is now a little better.
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