I am curious to know how you know whether or not your Mech. Open completely or not. If I hit a deer whether it is a pass through or not the blades will flop back l to an unknown position at time of impact. As in my case very happy where my deer have lied dead not more than 40 yrds away but all my deer have been relatively easy level shots. I wonder to myself if the shot was other than easy would my mech. Work they way I expect. I shoot currently the WASP Jackhammer SST. The blades can and do fall back into place somewhat leaving you wondering did they all open. So how do you know how well they worked?