KATSU Tubing Rolling Bender 1-1/2" Manual Square and Rectangular Tube Roller Flat Bar Bender for Mild Steel Copper Aluminum 165119

I started using this benders on 40 x 40 box section which is the limit of the benders.The trust bearing smashed in two as soon as I applied any pressure to bend the box.On investigation the tread is 20 mm and diameter going into the bearing is 17mm which provides only 1.5mm shoulder for the bearing to seat on. This shoulder is only the threads of the bolt. I screwed on two nuts to the threads and locked them together which provides a larger shoulder for the trust bearing. I purchased a new trust bearing and nor problems since.One of the bearings in the bottom idle rollers collapsed after an hours use. On investigation I discovered that the bore machined in the roller was too tight for the bearing. I machined this out to the correct fit and and fitted a new bearing. Several days use and the bearing is still ok.The handle is secured to the center shaft with an 8mm bolt tightening against a flat which failed after a very short time allowing the handle to rotate around the shaft. I welded a piece of metal to the handle to create a flat location point for the flat on the shaft. I also fitted a harder material bolt. This has sorted out this problem.In conclusion the benders works well but needed these modifications to make it usable.