Remember this old lens?
sold for spairs or repairs when I bought it
well, its repaired! took quite a lot of time to take it all apart, clean everything and fix all the issues, like a stuck broken UV filter on the front thread.
It was worth it though, look at it now :)
After doing this I actually bought a few more lovely Helios lenses to work on during lockdown so If you are interested in buying a fully serviced and guaranteed one let me know :)