Mast joiner - for 11 mm round

Mast joiner - for 11 mm OD x 9.8 mm ID aluminium tube, aluminium. Designed to be both stiffer and stronger than the tubes it will join. 

When using mast/boom spar joiners

Prepare alloy tubes and joiners by cleaning all matching surfaces with solvent (acetone, alcohol).

Use normal 24 hours epoxy resin, thickened as necessary to prevent the resin from draining out of poor fitting joints before curing, and ensure the parts are correctly aligned during cure.

Simplify cleaning by allowing the resin to partly cure between 1 and 3 hours, depending on temperature, then use solvent to clean off the excess resin from the joints. Check alignment again before allowing to fully cure.

If used for a temporary join, glue one end into one tube as described above. Then add thin self adhesive tape along the other end of the joiner until any slack in the fit of the mast tube is minimised.