...in weight between the 100 gr. Muzzy Trocar HBX and the 125 gr. version? Is the weight difference in the body of the broadhead, in the blades, or some combination of the two? Would it be possible to retrofit new replacement blades to up the weight of an old 100 gr. head to 125 grains? I have the same questions with the fixed blade Trocar. Anybody know?