[munter]

I don't advocate the cig lighter trick because it:
 - risks damage to motor pods, chassis, nylon pinions etc.
 - does not work for alloy crowns.

 Definitely risky....only ever used it as a last resort.....I should have investigated further to find the real issue rather than think I could melt my way to a good mesh.

The recommended toothpaste was always 'Arm and Hammer Advanced Whitening with baking soda'. I use it all the time, it is still the same formula and works just fine. 

Thanks for that specific recommendation, Brian. I must look for it but probably not available down here.
I am still not clear on mm/rev term....is it motor movement?
Thanks
John