In two minds as there aren't alot of 68x103 bb replacement out there atm and all the BB on ebay around£50 plus...
Took apart a UN55 non-drive side for the heck of it (currently job hunting...), pretty easy to do if you have 2 or 3 spoke width picks, or finer.
First pic is a black plastic retainer cap that fits tight over the axle and holds down a rubber dust cap. Note the pick marks from where I pried it off; would recommend using multiple picks and a flat tool like a c Hh sim checker to gently lift it around the circumference of the axle like a tyre off a rim. Note which side goes down because if you reinstall it wrong it’ll create loads of drag.
Second and third pics are inside of the cartridge: the grey/white plastic you see is the bearing retainer, which lifts off easily exposing the bearings. You can clean them out and regrease, but they don’t come out of the BB from non drive side.
Drive side axle has a tough retaining ring, possibly steel, pressed tight onto the axle. Couldn’t pry it out but didn’t force it.
Putting it back together is easier than taking it apart, just be careful with that black cap.
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