We have your RMB #150-110 machine which is a great asset. Lately we have been having a problem with bending square aluminum tubing ( 1 1/4 " X .125" wall ). We special order 6063 T4 and some times when bending, we get wrinkles on the inside of the bends which appear like " knuckles ". We are using 4" and 3.5" radius dies. I have tried slower speeds when bending and have left the material outside in the sun, hoping that the build up of heat would help. The metal merchant assures us that all the material supplied is T4. Could there be an adjustment on the machine to remedy this problem or is there some thing else that I am doing wrong ?