Hallo, i have got rusty urban frame form 60s maybe 50s, i wonder if it is possible to leave all that rust and only to protect it (with some transparent paint - i think) from further rusting?, other thing are frame hooks, they are in bad condition, is there any simple solution to fix it?, i do not want to restore this frame, so this solution can also be non standard, by the way, someone knows what type of bottom bracket is in that bike? i see it for the first time, there is also a pin in frame to block it - if i think well.