Originally posted by UncleVanya The real fix is a tear down, removal of the old lubricants with solvent and then a relube with the correct grease.
I could do that, but i guess Germany is a bit away. Search for some lens dissassembly guides, maybe you get one for that lens too,
I Found out, that often you could open it up just partly to reach a bigger part of the focusing helicoid. Then if you wont diassassemble further, just put a solvent (Benzin or Isoprop) on it, move the helicoid in and out (close-infinity-close) wipe down the grease and repeat until the helicoid is free of grease. then you can put a matching grease on the heliciod (only small amount), move again in and out and the heliciod spreads the grease evenly. I have a matching grease which works well for takumars, helioses and CZJ lenses, but dont know which is best to get in the us (maybe ask eric???). My grease is optical grease from Osim Optics, the type I can tell you if you want.
A quick solution is to put a drop oil and solvent on the helicoid and move. this makes old grease move again, but can migrate elsewhere.