Hello Simon
Many thanks for your kind comments.
The axles are just 3/16 nickel silver drilled 5/32 to mount the male part of the wheel. I remove the brass hub containing the square hole then mount them on tufnol bushes. The wheels are then mounted and pinned on them. I also remove about 1mm from the back of the wheel to give the spokes a more slender appearance. I do reduce the wheel profile to if needed for clearance problems with brakes etc and to make the wheel look nicer!! And also scale 7 profiles are catered for!! Crankpins are replaced with Derek Mundy's lovely product to!
Hollow axles are not a problem, but I only drill about 10mm in, but you could drill all the way through if needed, but the taper pin would be visible if you looked direct at the end of the wheel.
Have included a picture of a Finney Coronation that I built, but cant claim credit for the loco body as that was built by the customer!!! It has Harris wheels I turned with a hollow axle, but not all way through!!
ATB
Andrew