Bending HVAC linesets: two at a time?

[aardquark]

Looking at a typical tubing bender that handles different size tubing, like this:
,
I can't help but wonder if it makes sense to bend both tubes at the same time. Is this a great idea (because both bends end up being perfectly aligned), or a really bad one (because something awful is about to happen on a $200 set of lines)?

 

[PCustoms]

Those tools aren't meant to bend 2 lines at the same time.

The 3 sections you see are each sized for a specific diameter line.

 

[justinjoyal]

^^ What he said.

What size tubings are you trynna bend ?

 

[aardquark]

Those tools aren't meant to bend 2 lines at the same time.

The 3 sections you see are each sized for a specific diameter line.

Understood. But the lines are different sizes as well. In my case, a 1/4" line and and 3/8" line.