If your using 20mm conduit, you need the 20mm spring or you'll end up kinking it.
For 90 degree bends you need the heat to help with the bend or you will snap the conduit into your face which I've done.
I just rub/chinese burn style with one hand on the point of bend and it seems to do the trick.
What I've noticed also is that there are various brands of high impact conduit which are different in respect that they are of a lighter material and bend much easier.
I currently use Mita branded conduit and its great to work with. Tried some of the screwfix conduit one time and it was pure bullwork trying to bend it.
For 90 degree bends you need the heat to help with the bend or you will snap the conduit into your face which I've done.
I just rub/chinese burn style with one hand on the point of bend and it seems to do the trick.
What I've noticed also is that there are various brands of high impact conduit which are different in respect that they are of a lighter material and bend much easier.
I currently use Mita branded conduit and its great to work with. Tried some of the screwfix conduit one time and it was pure bullwork trying to bend it.