The spacers are now permanently secured to one of the seat back braces.
This assembly was placed into a temporary jig so that it can be aligned with the 2nd brace.
Workshop temperature was 25 deg C and humidity 58%.
18g resin was mixed with 7g hardner and flox.
The flox was applied to the edges of the spacers and the 2nd brace was positioned on top of the assembly in the jig. Small nails were inserted through the pre-drilled holes to hold the brace in place during cure.
Weight was added on top of the assembly and the jig was removed.