Originally posted by Wbl24cam It's a shame that it seems that the sellers haven't had a good look at the lens mechanically. I've got a set of glasses screwdrivers and I'm planning on getting some lithium grease for the helicoid, unless someone has any suggestions as to what to get?
The screws are JIS standard and use of other than JIS screwdrivers is done at the risk of stripping the heads. Relubing may require other specialized tools, depending on the lens. As for grease, the grade and type is important due to the tight tolerance of the threads. I use something called MicroLubrol Helimax-XP, made specifically for optical and instrumentation helicoids. A 28 gm tub is about $13 USD. You will also need naphtha or similar for cleaning out the old grease.
Are you sure you don't want to work with the seller? It is quite possible that they did not properly reassemble the lens, with the binding being the result.
Steve