Very elegant solutions. I was in a hurry one day and just stuck a length of plastic rod (Nylon or Delrin? Not sure of diameter but maybe 2/3 of the wing pin?) in the overlapped main spar holes and pushed/pulled on the rod to lever the wings of my ASW 24 together the last few mm. Been doing it that way for 20+ years since.

It only works if the wings are within a few mm of being completely inserted in the fuselage. It's not like the Libelle over-center wrench that you could engage when the wings were very far apart. But IMHO, any device like this should only be used to snug the wings together the last little bit.

Chip Bearden