Originally Posted by Grumpy2

I'd recommend using something like this for bending thin walled tube.

https://www.screwfix.com/p/lever-tube-bender-6-8-9mm/17898


Yes they work, or a brake pipe bender, your local garage may lend you one
https://www.carbuilder.com/uk/brake-pipe-bender-for-316-inch


Jon M