Bob

I believe the alum is 6061 solid rods from IPS, El Monte, Ca. They are remnants and sold by the pound. I would get a bit larger than 1/2" and turn it down as needed.

Since tires are being mentioned i thought I would post a pic of my 1/5.0 scale LG set up I am one day going to use on my 80" 109 G2-6. The tire/hub is a test run of a concept I tried years ago to make tires/hub ourselves.. Really hard and heavy 60 shore rubber. But we have a pretty good idea today of what should work.

Timed out will try later

Oh, before I forget, CMP is not known for getting the CG right. The diagram shows the CG a bit to far back for what I normally use for forgiving flight. Use what you know works for you in the past on warbirds.

Steve