Danny D. wrote:

I can not get 90 degrees turn with 18" winding bars due to the
structure of the door and the ceiling.

Let's look here to see if Dan Musick has ideas already in his videos:
http://ddmgaragedoors.com/diy-instru...-door-torsion-
springs.php

I'm viewing those videos now ...

He didn't cover it - and - well - I'm having a hard time visualizing how
18" couldn't be available, nor, how a 45 degree turn wouldn't be available
(since the garage door is many feet in length), so we're gonna need a pic.