Hi BLUEBIRD, hi RATS
Many thanks for your compliments mates.
Yep, it is 50p coin not in Russia for sure but it was found in my pocket? ::) occasionally. I decided to put it aside as it will be more recognizable here rather than any other piece to 'feel' the size of the engine.
I have made a new crankshaft (more rigid), bearings, connection rods etc. and only then reached the Stephenson link...To be continued.