As Jim said I have a f45 that I bought new in 1992 so it’s a bit newer than the one you’re looking at. Also Ive been pretty much a one man shop so the use is different. Mine has phenolic ways and there is no problem with them. From what you’ve said it sounds like the saw is working fine. Seems like you mentioned getting it for 1500. If it were me I’d buy it take it home and use it until it no longer worked “fine” then look at either rebuilding as needed or get rid of it and replace it.
Steve Jenkins, McKinney, TX. 469 742-9694
Always use the word "impossible" with extreme caution