Macgregor Persimmon preservation
I am hoping to get some advice on techniques for preserving a couple sets of older Macgregors I have. They are original sets that show signs of play through the years and the sole plates and toes have areas where the finish has been rubbed down / scratched. I found a few sources that recommended applying linseed or tung oil to the heads as routine maintenance. I'm reluctant to do anything without experienced advice as I don't want to do anything that can't be "undone" (aka me **** up the clubs). :) Thoughts on routine maintenance?
Additionally, at what point are these clubs beyond routine maintenance and in need of more of a restoration / rejuvenation work? I've attached a picture to illustrate one set that I am looking at in particular.
Thank you in advance!