Someplace near Springfield that sells aluminum square tubing by the foot? (3 replies)

I would think Home Depot or Lowe's do this but from looking at thier websites I cannot tell.

The main piece I'm going to need would be a square aluminum tube 2'x2' and about 6 feet long.

I'll add a photo of what I want to build, it's a catapult launcher for my RC flying wing.