I have been slow on this LeTour, but the other day I managed to pull the headset and BB bearings and promptly chucked them in a bowl of citrus degreaser. At the time, I thought it odd that the drive side bearings required pulling the cover off from the inside.
Now I understand why. Someone in the years before cartridge bearings became the standard, decided that if the balls were locked in place between metal guards and pre-lubed, it would make for faster installation. I can think of no other reason to do this - behold the Hatta pre-lube BB cup!
I guess I was supposed to remove the fixed cup en bloc like the adjustable side - but I’m pretty sure it is rust-welded in place at this point ….