Better M42 helicoids?

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E Dinkla Senior Member • Posts: 1,649
Better M42 helicoids?

I have two Pixco ones for some time. Short and long one. Ordered from China.

Both do not reach to the quality of even the worst helicoid of my vintage lenses. I had to repair the short one and noticed that the design aims at as much expansion as possible within a short package. Which creates a loose total which does not keep the lens aligned either. Thick grease as applied by the manufacturer disguises that a bit but it also spreads out internally and externally.  i have looked at replacing the round helicoid keys with longer rounded off rectangular ones that could help a bit but doubt it is worth the effort. Sacrificing some throw is not an issue for me. Looking for some bad glass vintage lenses now with a nice helicoid to use.

Any recommendations for better M42 helicoids ?

Met vriendelijke groet, Ernst
No photographer's gear list is complete without the printer mentioned !

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