I'm back with more annoying questions. I've been doing a little research on this old gal [where I found this forum] and now discover that my unit is incomplete.There is no cover on the ??range wheel??. To scribe a reference mark on the body to the left of the wheel is no biggy; but what impact would letting that yellow disc with the arrow on it "float around" have on the unit's performance? As much as I'd love to restore it to original [I bought it as a collectible/maybe use it] , I know there isn't a snowball's chance in Haiti of finding a replacement. If required I would have no problem fabricating a new one, but why if not required,right?
Thanks again folks, Darren