I remember building a Finney M7 a long time ago and used the EM spacers at the back end to help getting it around curves! Must have been a long time since I am now adapting the Hornby models...
davebradwell wrote:You might slot out the hole in a couple of 2mm washers so they can be clipped onto the worm shaft to reduce the end-float without any risk to the running, Julian. Top tab is my favourite method of restraint but that will probably interfere with your ballast weight. As you say, if axle can rise, fall and rock and gearbox can't flop too much then it's probably not too bad. Check axle can rock - that's the usual trap and can lead to derailments.
Very slight improvement in running Dave, thanks for the suggestion, after putting in another washer so there is almost no end float in gearbox. Forward is now no more noisy than reverse. By the way the front axle is fixed.
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