After the glider is assembled, and before the pilot does the PCC,
doesn't he walk around the glider and inspect the control surfaces and
move them through their full deflections, in addition to other
inspections? Isn't the improperly assembled elevator noticable during
this inspection?


Apparently not. A Twin DG at out club has a small storyboard attached to the
top of the fin leaving no doubt in the riggers mind exactly how , where and
when to put things when rigging. I helped with the stab assembly once and
when it didn't go together easily. I suggested the pilot read the list on
the tail, we removed and refitted the stab discovering in the process that
it had gone together wrong first time round! Everything worked OK but the
travels were all out of kilter.

Ian