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<p>Love this forum.  Thanks for all the ideas and offers Frank, Ed and Dave.  That is very helpful.  The knurling sounds a bit like something I do, and a little simpler.  In some cases I have sanded the gear portion of the shaft in direction of rotation to get a little bite on the surface, and then set a tiny dab of locktite into the gear first.  That helps, but one has to be careful not to let any locktite near the bearing block.</p> <p>Ed, I will check out the second unit.  I have "locktited" the first six axles.  The second unit is newer and perhaps is all tight.  It is great to have an offer of old parts.  I am appreciate that since I am r and r ing these units only because a nice fellow on HO swap sold me two nearly pristine E shells for a fraction of what sellers on Ebay wanted....and mailed them for a fraction.  New to the swap sites, so I am going to ask there too.</p>
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