In theory building a 7mm scale Barclay should be the same as building a 3.5mm scale one - just a bit bigger.
On the HO model locomotive I had to bend the connecting rods between the jackshaft and front wheels to bring them into the crank. This wasn't a problem on the OO model as we could use a wider (EM) axle of the crank, not an option in O gauge.
So I did the same on this model. And it worked.
OK, the holes in the rod have to be elongated a bit for smooth running but then I tend toward masses of slop in this area anyway. It's only decorative and so the most important thing is not to impede the rotation of the wheels.
So now I have a free running chassis that can be pushed back and forth on the workbench with everything rotating as it should. All that whirling metal looks pretty good too.
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