3M tape might come away with the heat, so we needed a better way to attach the carbon fibre duct after it is moulded in situ. I decided to turn and thread four spiggots, then drill and dimple attach holes in in the crescent. Next I'll screw pins into the threaded holes, rotate the fuselage, sculpt a wax mould with an inlect and vacuum bag a carbon fibre lay up over the whole lot. Later the pins can come out and the holes they leave will be perfectly positioned for screws instead.