I have also have another method for bending tubes that I want to try, so we picked up some 3/4 inch plywood and so far have been able to construct the wooded base curve to bend the tubes on. It is three layers thick, with a routed groove in the center for the tube to sit in and is based on a 24 inch radius circle. Here are some construction shots:
We still have to add a base plate to the curve, a strap to hold the tube in place and then we will give it a try. I have some straight gauge 4130 on the way and will take some photos of the bending process with it.
Big props to one of our customers, Jackson Smith, who started the Arizona Trail 300 on Friday on his True Fab 29er and is so far doing well in the race. Here is some links to track his progress:
http://www.topofusion.com/azt/
http://trackleaders.com/aztr
http://www.bikepacking.net/forum/index.php?PHPSESSID=eaed8d9e148db62599f8ba34770f7bb0&topic=753.40
Keep on rolling there Jackson, we all are watching your spot tracker go!!