My first electric guitar was a 1971 Harmony Rocket H53-1 which I still have. It is a hollow body, double cutaway with a single Dearmond foil pickup in the neck position. The guitar plays and sounds fine but I am missing one of the ferrules that is inserted around the tuning post to keep it centered. It stays in tune ok, but I'm sure could be better. I have a brand new set of Tone Pros Klusons that fit the spacing and screw holes perfectly. The only difference is that I would need to open up all six post holes. Would the Tone Pros be a significant upgrade in tone and tuning stability? Would it detract from the value of the guitar now or in the future. It's probably worth $200-$300 tops as far as I can tell. What are your thoughts? Thank you in advance.