The original tuning heads on my '60 SFIII are getting stiff to turn, and are not holding the tune. I have put some light machine oil in the little hole in the back with no reall improvement. So I would like to replace them with original style heads. They are nickle plated, Klusons with metal buttons. The reviews I have read do not seem to be too good on the Klusons, but I do not want to drill holes, etc. I am inclined just to get a new set with the hopes that they will do much better than my 50 year old set. Thoughts?