<p>Thanks guys. The pictures are all from models I did several years ago, so I have to dig them up from an external hard drive.</p>
<p>Sometimes I use the wrong word for a detail or wheel, but I am sure you are getting the point.</p>
<p>So Jim,the pinion is the wheel on the rear axle. The second on is the crown, but this is actually one part with a third wheel. I will explain this with the pictures.</p>
<p>Tick, two things were prone to adjusting, and make the system go wrong. Firstly the weak pinion wheel, as explained before. The second weak point is the iron cover, covering the big fly wheel. As it is attached to the baseplate at three points, the distance between the horizontal part and the flywheel is minimal. Therefore, the slightest bit of rust, or miss-alignment of the flywheel will cause the two parts catching each other, and the flywheel will not run freely.</p>