The skirts used AACQ-4-4 rivets along the canopy edges and CS4-4 rivets along the lower frame tubes. The AACQ-4-4 aluminum rivet mandrels often hung up in the rivet squeezer after popping and had to be tapped out with another loose mandrel. Five aluminum mandrels broke slightly proud and were cut off with flush snips. Temporarily fitted canopy latch to check fit.