Hello! I have a few marklin OO (really HO) Signals and switches I want to get fixed, I was thinking of mending them myself (Its pre-war 1930s track) I was wondering what is the best way to fix such old pieces? I have an old signal I'd love to get up and operational again... It is a semaphore signal any help would be appriciated! I'm eventually going to use the track for a layout...