I recently got my hands on a set of old 2.5-octave Jenco vibes for dirt cheap, but they need some serious work. They came with damaged cardboard resonators and I've been looking to swap them out with some aluminum or brass. I found aluminum tubing at Lowe's and Home Depot with similar diameter and wall thickness compared to some measurements I took off other vibe sets, but ounce-for-ounce this stuff is pretty heavy. Would any of you happen to know the alloys the companies commonly use in their resonators, or where I would be able to buy some? Any help would be appreciated. Thanks!