thanks richard.
I fixed many a lens with your videos of course. I am sure they have had also a big impact on many many other nikon owners. I have one problem lens though: a nikon 135 f2 K lens. Helicoids are great without the helicoid key in place. As soon I reinstall the helicoid key focusing is not as smooth as I prefer. I have not touched any of the helicoid key guides but I did notice one of the guides have two screws that probably used to set the guides. Is it wise to try to readjust?
