So the tubing benders I use are the Rigid 400 Series... and they have these various markings on them for where you need to start your bend - and this depends on where you MEASURED from.... whether you measured from the left of the tube or the right - and if you FLIP the tubing 180* then you need to reverse where you set the mark. SO if you measured from the left and you need to flip the bend then you'd set your mark using the R (right) instead.
Personally -- some times I get so turned around that I have to just stop and regroup!
This is a photo of what I use. Note the bend radius. This has to be subtracted from your measurement. So lets say you're going to need a tube 9" long that is straight line measurement - but it hits the frame and goes 90* at the 9" point --- then your mark would be make at 8 1/16" because if you then set that mark in the bender - your tube is going to come out at the 9" point -- but this is where you get into the "right" - "left" - or "center".
Maybe Mark will jump in here and try to help me out -- cause it gets real confusing and is even worse trying to write it up here in a post!
