[Richard Dryden]

Hoping someone can help. I have bought a 12 t pipe bender off eBay to create my roll cage, I was assured it was capable of bending 50mm pipe with 2 to 3 mm wall but am finding that every time it kinks rather than smoothly bends the pipe. I have tried going from 2 to 3.2mm wall as I was told this may help, filling with sand and heating all to no evail. So I am hoping someone has had experience with these things and can offer some advice. The bender in question is eBay item no 170974868543.

Hope someone can help.