Well, since it was one of my posts on RCG that ETPilot was responding to, I guess I'm "responsible" for this thread. What I have done to my landing gear is to solder a washer on the inboard end of the axle. The outer 1/2-3/4" of the axle has been annealed, which is a fancy way of saying heated to a dull cherry red with a torch and allowed to air cool. This is done to soften the metal so it can be drilled. The music wire landing gear used in the PT60 is hardened, and you will destroy drill bits trying to get through it.
I destroyed three of them before getting on the internet to find out how in the @#$%&^ to drill this stuff!
After annealing the wire, soldering on the inboard washer, and marking for the hole to be drilled, I used a 5/64" bit at 1390 rpm, and used a pecking motion to slowly work through the wire. I ground a flat spot for the bit before drilling. I then installed a second washer on the outboard side of the wheel and installed a 1/16x1/2" cotter pin to secure the wheel.
Nice and neat, and I think it looks a lot better than a wheel collar on each side!
One of the inner washer will get a bit more solder, though
.