Vaseline? Are you being serious? I'm not condemning here; I have a 105mm Nikkor-P with a really stiff focusing helical, and if Vaseline works, doesn't creep or run when it's hot outside, I'll try it. I've had this apart before and, with no CRC groups to be found, the hardest part is getting the helicals back together in the right relationship and that's easy enough. If Vaseline has worked (and worked well) for you I'll give it a go. I'll order some of the "real stuff" too.