Time for the Posterior. EDIT: All armor adjustments and and rivet placements are made from preliminary fitment measurements of the armor owner.    5. Posterior (Posterior & snaps)   Posterior - Remove excess snap section plastic. From outer edge measure and remove 4cm worth of material..      5. Install snaps.    From newly cut edge, measure first hole to drill at 15mm, 2nd hole at 35mm.      5a. Using 5/32" drill bit, dill both holes. Once completed take a 3/8" drill bit