My question is how much back set is to much starting a 68" form and would like to get it right the first time. Thanks
What style bow? I think that would make a difference.
68" flat back glass lam.
3/4 to 1 should be fine. I use 1 for 68 ntn. Out of the form and finished tillering gives slightly less.
I have gone with three inches and had no problems. Backset on longbows is a very personal preference feature. It will increase the pre-load and allow a little more energy storage. If this is a first, I'd suggest about an inch give or take.