Traction tires must be glued on (hacky) or have grooves cut (or filed or ground while ran) into the wheels. The groove is the way to go. Eventually dried glue build up, or removal of it by tools ma6 put them out of round imo.
I'd consider a careful closing of the spring tab gap to ensure a spring never takes out the armature plate (watch the tube doesn't warp). I've closed the gap before on one post war engine where the spring kept creeping out of the gap Other than that, the brushes have slightly less travel till worn, but that takes years as is. Postioning of the spring as is, will also help prevent a worn brush "disc" from falling out and ending up "who knows where".
Brushes usually conduct very easily, but I wouldn't count them out as a cause for higher than normal resistance, especially when the factory read around them as well to get thier numbers. If you get a good numer with them it's fine, only bad readings should be questioned.
If a motor is getting hot enough to burn windings up, you will usually know it fast by the shell heat or the smell. I often ran my post war till the shell was nearly hot to touch, my Marx CV gets painfully hot if heavily loaded for an hour or two or in need of a brush/arm. cleaning. I just think you got the "monday morning" motor, luck of the draw.
Interesting page glitch...I just accidently dragged my composer's right margin closed, narrowing the composer box; but I can't reverse it or repeat it. The blue is normal size, the white is about 75% and shifted left leaving less than a space width of blue to the left and about a half inch of blue on the right side....?
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