Originally Posted by
HillRider
Judging by the rusty, dirty appearance of that bottom bracket and the fact it's a "nutted" spindle, it's a low quality bottom bracket to begin with and now in very poor condition. I recommend removing and discarding it and replacing it with a suitable cartridge like a Shimano BB-UN54 or BB-UN55 in the right spindle length.
Apparently you have been able to remove the non-drive side lockring and adjustable cup. You will have to remove the drive-side fixed cup and that's almost always a lot tighter and requires a different special tool unless you can improvise. It might be worth the few dollars to have an LBS remove it. Remember the drive side is LEFT-hand threaded.
"low quality" BB's never have seals in the cups.
and a good quality BB of the type pictured will outlast any "cartridge bearing" BB i've ever seen.... if properly maintained.
the OP should remove, clean, inspect, and reuse that high end BB if at all possible.
"Cartridge" type BB's place the bearings further inboard on the spindle, increasing bearing loads.... and you must replace the entire unit when a bearing goes bad(and they DO GO BAD!).... sure sound like a cool idea though, eh?