Not really a question so much as a RFC (Request For Comments)
Ok so I picked up this very dirty (VERY dirty) SR500 for not too much money.
Although the bottom bracket felt smooth, I take nothing for granted and had the LBS remove the BB and rather than take any chances and went ahead and installed a fairly new UN54 I had lying around, because I don't have the tools for the older Shimano "adjustable" type BB anyway.
Turns out most the components on the bike were, once clean, looked as new as the day the fell off the assembly line. There's no discernible wear anywhere in any bearing, cup, cone, bolt, caliper; heretofore I was admonished for abandoning the cup and cone BB for the cartridge and to switch back to it. I'm certainly leaning that way. Again, I don't have the proper BB tools to mess with it ever, myself, but I understand that these things last a pretty long time once installed properly.
This is the type of BB I mean: