As a jumpmaster/tandemmaster I rarely get a pincheck... I ALWAYS check my (own) pins... As soon as the rig is on my back, the pins should stay where they are (and if they aren't, wellll.... they probably don't stay where they are after the pincheck anyway). Move around in the plane preventing your rig to touch ANYTHING... consider what you are leaning/sitting against... (like the bar you see in the back of C-206's, it could push out the reserve pin...) A pincheck is more than just a check of your pins... (as you can and should check them yourself). Also routing of (chest-)bands and looking at the rest of the equipment (RSL, Alti, helmet, goggles, etc, etc, etc) I always check other people that way, whether they ask for it or not...