It takes a small allen wrench and about less than thirty seconds to change both blades....we will provide the wrench in our replacement blade packs.
As for poundage to begin compression...come on...can't a guy keep some secrets from the "Other" companies for a while?
I prefer to make them do thier homework if they have a question that detailed. I've done mine...and although we have patent pending any compressible cutting width technology attempts...I still prefer if they have that detailed a question...they can go do thier own homework. Suffice it to say....you don't want to push on them with your fingers...It's like a one ton truck suspension ready for heavy work....ya'll will get cut....but at the energies current bows are transfering to arrows/broadheads coupled with that impact of bone...things will move if necessary and then move back when past the bone.
Sound like a reasonable answer?