Rear axels rebuild. O1 S

[Meir]

1. Well, I used the old nut before pounding the axel. (It looks like a pancake now) but using a brass cup is not a bad idea, the original nut has grooves on it so the edges tend to claps. I hope with the brass cup I will have more surfaces to work with.
2. What kind of solvent should I use?

Thanks again