silencing a noisy model locomotive

A few weeks ago I re-motored my freelance locomotive no. 17 William Wallace. This model has an ancient Arnold mechanism and began running erratically. The new motor improved the running, but it remained very noisy. I traced the cause to the knuckle clutch between the motor and the worm shaft. Yesterday I put a little silicone sealant into the clutch, which reduced the noise considerably. Note that the motor and worm shafts need to be aligned exactly to prevent binding.

[@johnzubrickas5235]

An elegant solution. Well done

[@highdownmartin]

A rubber sleeve would transmit quietly and still have a little leeway for misalignment. But you've got a good result anyway. !