For the Goole Radio and Electronics Society entry in the RSGB SSB Field Day contest, we needed to fit some 3m extension scaffold poles on top of a pair of SCAM12s to support our doublet. I made up some 40mm spigots which are a push fit into the poles, and fitted a locking bolt, and made the SCAM spigot as a sliding fit at -0.15mm as usual. Made from aluminium extruded bar stock.

I made up some M8 threaded lockbolts by turning down some M10 bolts to 8mm diameter and cutting an M8 thread on the lathe.