On RG7s the noise is usually the little gear on the motor slipping back. ?Plastic on steel shaft, I loctite mine. It might be worth just pushing it forward a bit. See if that improves it.
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I have built a Slaters version in 1930s condition and have an early L&B Models one to build which will be in its earliest form. I anticipate getting the new Slater wheels with cranks etc for it when the time comes. They are nicely engineered.?
My one problem was the Slaters SG4 motor and gearbox. It is impossible to assemble as described. I substituted an Portescap RG 4 as the motor can be detached from the gearbox. I think a High Level gearbox and motor would be better actually as the RG4 is
a bit noisy.?
Paul?