Dicko: Sure, you're allowed to link outside places here. The forum is a place to learn, and sometimes outside links get the point across best
About the ligaments: I'm not sure if you know this, but in terms of ligament gains, every inch gained transfers into only roughly .25" NBPEL gains. The other .75" is bone pressed. The reason most ligament gains are only BPEL gains is that the pubic bone is slanted inwards.