G'day all, I have a Spectrum Baldwin Consolidation that has binding axles I think due to miss alignment of the crank pins. It has 2 tight spots in every full rotation and locks up and stops  going forward and just jerks and wobbles through the tight spots in reverse. I have adjusted the crank angle slightly on the rear set as this seems to be the problem area but this seems to make one spot tighter and the other slightly better.
Anyone have some ideas?
Also is there available a replacement final drive gear for these locos?
Thanks.

G'Day, are the mechanicals and chassie the same on the light and heavy class mountains loco's? I am trying to get a light for scratch building into  local [ SAR- South Australian Railways ] loco's and seem to only be able to find heavy mountains on the net. Thanks!