you know it is a cool machine especialy considering it was made in the mid 1950s as far as front and back nope that is what i thought it is up and down on rim and those screws devices are counter wieghts to center bubble at one end not front and back its the arrow and the up and down that...
you know there are great books out there on this subject try menards or lowes or even home depot i think you will understand a lot more after reading about it as for expansion strips and seperators for them there is a good reason for them and the specific materials used in them do not take...
i am a old pipe fitter from idaho and you can run the black pipe very easly but use teflon pipe dope on fitings as for leaks you can check your self with a 30 lb gauge the system to pass inspecion must hold 15 lbs pressure for 24 hours as long as that works your good also on pipes you must make...
i have recently purchest a flite possitive wheel balencer (bubble type) model # 772A made by wilbur c rexroat D.B.A. dynamic center engineering co inc in lawrenceville ga possable for hoffman global inc patent # D181107 this is a strange but useful balencer if someone could tell me how to use it...