There must be a million of those later Marx transformers still out there, that were usually included in sets. They have a
metal teardrop shaped "knob" on the top, that in most I have fooled with, seem to be hard to turn. The older vertical
ones with the red lever on the side do not seem to have this problem. Many of the horizontal ones seem to need a lock wrench on the knob to start a train. Since these have 110/120 going into them, I am not trying squirting 3-in-1 oil or
whatever on them, which might be conductive. What is the problem and how can it be fixed? Maybe using graphite or
some such...pop the knob off, and reset it...or ??
