The cheap 100 GS crank does not come apart. To Bad.
I could cut the big wheel off but that is even a bit to hillbilly for me. So I installed a cheap Shimano sealed BB and put it back together. The beater looks nasty and that crank is like a boat anchor.
The cassette is hardly worn. But now that I find the original tires still on the bike I guess thats why. The pulleys on the RD were like new under mounds of crap. The cassette is 13-30 so that's decent gearing.
The rear bearing races and cones were in excellent shape. I was worried when the skewer was rusty but all is good to go in these early "sealed" units.