Next thing is to lay the rigging over the shoes. The instructions recommend using a piece of thin card to prevent the rigging fouling the wheels, but how thin should it be?
From photos of the prototype the clearance looks negligible but my model's axles will have some sideways movement so I'd better make enough allowance.
Decide it's time to do some calculations to understand exactly what I'm doing.
A member of the 2mm Scale Association has kindly pointed me to a diagram in our Yearbook which shows that the back-to-back (the distance between the insides of 2 wheels on an axle) should be 8.5mm. The total width of the chassis is 7.6mm, so there will be 0.9mm of space between wheels and chassis. So when I put the wheels on I'll need to make sure that there's 0.45mm space on each side.
So I'll also need to make sure that the muff is central along the axle, giving 0.25mm play either way. If I do that no wheel should ever be more than 0.7mm from the chassis.
Now I can see how this looks.
I’ve added some pieces of 0.7mm plastic strip under the wheels to represent the extreme of the wheel movement. The wheels still move freely, and I can see exactly how much clearance is needed.
Can't think of a good way to cut the wires really close to the rigging, so I just file them back slowly.