Al Aitken

Number 3 frame marked for trimming

Front spar gear fittings nestled into main spar gear fittings for alignment while gluing number 3 frame to front spar.

Number 3 frame glued and clamped to front spar while aligned with main spar and number 4 frame.

Number 3 frame glued to front spar.

Thread used to align number 3 frame with number 4 frame while gluing number 3 frame to front wing spar.

Test block glued from same batch of glue used for number 3 frame.