Originally Posted by
ralfstc
That's a really clear and helpful explanation, thank you. Does the plunger tube move independently of the sac protector? Could the two metal components be seized together? There is a hole at the top of the sac protector, looks to be about 2-3mm wide on mine. I would try a tiny long screwdriver and see if I could get at the knob attachment screw through it. That almost definitely wouldn't work, so I would soak the whole lot in water for a couple of days (it's already rusty, most likely) to get any ink residue off, and then try to heat the metal parts up with a hairdryer. They appear to be the same metal, so they won't fly apart, but they may react differentially enough to the heat to loosen ever so slightly. I'd consider antiseize compound too. Or even oil/WD40.
The biggest trick is going to be how to unscrew the sac protector from the plunger tube. It's a regular right hand thread (anti-clockwise to loosen), and it's about 2 1/2 turns (rough guess based on my own snorkels). All the metal is thin and easily bent. I would probably try a thin pair of pliers inserted into the sac protector and held open to bear on the inside of the protector. If getting desperate I would always try a removal approach that spun the protector anti-clockwise in the hope it would loosen before things got too dire.
This is a great challenge. Hope some of these ideas help!
Good luck!
Ralf
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