[Ansteorra-archery] Help with a 150# fiberglass crossbow prod

[Lance]

Hello all, i just recieved the prod i ordered but i do not know what measurement to use from the belly of the prod to where the notch lock release point is.

I am going for around 140# or so to not max the prod out. Does anyone else use a fiberglass prod close to this weight? and what measurement do you use?

Thanks!!!
Lance