|Works a treat!|
He suggested I use one of the new black bevel gears from the new Evolution sets. Brilliant! why didn't I think of that?... Something I only realised recently is that it is possible to thread the socket/hole of any Meccano tri-axle part without preventing it from being used as intended. This made fixing much easier. A tyre with a spacer washer inside can be bolted to the socket of a plastic bevel and plugged into the top of the smoke stack. I think this is a huge improvement, Thanks Mike!