If it's in a Alphax/Betax shutter, and you're intrepid, unscrew the front and rear elements, give 'er a good lighter fluid bath, cycling the shutter on one of the higher speed, and exercising the aperture blades while drying, you might be surprised, the alphax/betax shutters are nearly indestructible.
If it's in a Alphax/Betax shutter, and you're intrepid, unscrew the front and rear elements, give 'er a good lighter fluid bath, cycling the shutter on one of the higher speed, and exercising the aperture blades while drying, you might be surprised, the alphax/betax shutters are nearly indestructible.
Better still, trike (trichloroethane) or ether. I have seen it asserted that 5% clock oil in the trike/ether will lubricate the shutter bearings but I've found that plain, light organic solvents are fine.
I use a trichlor blend as well, have a widemouth pickle jar half full that I just drop a shutter into for an hour or so, though it's quite a bit harder for your average person to find trichlor or one of it's replacements.