This is sort of a cross post from the Mechanics forum.

Ive got a old 1963 Raleigh (Huffy) sportsman with cottered cranks.

Ive regreased the spindle but i cant get the cups right.....or there is somthing wrong the with cups because i now have play in the spindle at certain spots. IF i turn it a feel some resistance in spots and it is loose in others upon rotating the spindle. Not the same spot on every revolution. Ive tried new bearings......and ive also tried a different raleigh spindle that took forever to source. because i saw a ridge on the bearing surface of my old one. THat didnt do it. it still remains. I do beleive the bb is that damn witworth threading which makes this even more ridiculous. The adj cup seems fine. No pitting or wear that i can see. IM wondering if the shel is warped or cast badly which seems odd because these are built like tanks. .......or maybe the casting of the cups is messed up? I would think that this would lead to consistent looseness and binding per the revolution of the spindle so that almost doesnt make sense.

I have no idea what is going on here. Driving me crazy.