Epoxy or GG
vaseline
toothpicks
q-tips
Test fit each hinge into hole - ensure pin can be fully inserted into hole
test fit all hinges and ensure full travel of control surface is available
Apply vaseline to hinge area of each plastic elbow hinge using q-tips.
(this prevents glue from seizing hinge)
View attachment 3370
Apply small amount of glue to one side of each hinge and insert hinge into one side of surface to be hinged
(or use toothpick and apply epoxy/GG directly into hole)
ensure that each hinge is exactly 90deg to surface and fully inserted
Apply glue to other side of hinge and install second surface to be hinged.
Continue moving and testing control surfaces while glue begins to set. If using GG, wipe away excess glue as it foams out of holes.
Once glue has started to set and GG has stopped foaming, ensure that all hinges are moving properly.
Let glue dry overnight.
Done.
feedback welcome; this approach worked well for me when I did these hinges on my 65" Vyper.