Himself reports that the loco now runs more smoothly and without the notable lurch it had before.
Closer inspection of the old wheel sets suggests that the problem was not a driving wheel which had the axle hole off-centre, as we suspected, but a tyre which was not a perfect circle.
The shot above reminds us what a lovely looking model the Mercian Kit made before it was withdrawn from sale - it's a shame the chassis / gearbox design was such a horror show.
As I recall, it was impossible to fit the components provided with the kit into the space available and Himself bodged it up with a replacement gearbox.
I suppose our Pony will have to be put to one side until we see what the real one looks like when it's finished - fingers crossed it will happen in its 150th anniversary year.
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