If you pin it like Randy says in center, and have washers on the form like Robert's , tape it down good(don't tape on form centerline so you can give a visual of c/l marks)you will be fine.
I have quit using the end set of washers that Robert has there, if a lam is bowed edgewise, you prob won't pull it in line anyway. You have plenty of width at limb ends to profile so if you're good at center and midlimb, the end can be off a little....