Thought i was the only one!!
I get pretty consistent results holding the body of my steel tape in one hand and the hook end like a pouch. Draw like normal and hit the lock.
Dont know my draw.. did at one time.. but after doing all the math an cutting them I found I liked them almost an inch longer anyway so close enough is close enough for me
My draw length changes with color of band or hair I forget what where talking about lol .
I have to tune the active length to a certain feel for me and see if it’s hitting where I want it too at that distance I am shooting
i usually cut my bands at 35 cms long, but depending on the brand i'll have to adjust, so i don't bother measuring my draw anymore...