Use 6061 (T6) aluminum for your landing gear. DO NOT try to bend it cold - it will fracture internally.

If you go to a metal shop and ask nicely, frequently they will give you some "cut offs" for free (cut offs range from a couple of inches long to about 20")

You will need the following equipment: A vise, A BLACK magic marker, a propane torch and a couple of pieces of 2x4.

To bend T6 aluminum mark where your bends are going to be using a magic marker. Put the aluminum in the vise and heat JUST the bend mark until the mark turns BROWN.

Now take your pieces of 2x4 and use them to bend the aluminum (Keeps the aluminum nice and straight and you don't get any tool marks in the metal).

When you are done with all your bends take the LG and set it aside for a few days. After about 5 days T6 aluminum will reharden itself to somewhere between a T4 - T5.

Do not drill your axle holes until after the metal has rehardened as you can easily change your bends while drilling the holes (don't ask how I know this)

I have used this procedure on 11 lb planes without a landing gear failure or having them "spread".