I used 0.3mm solder wire for the Hercules wires on my 1/48 Beaufighter. Learned a lot with 2 for 28 cylinders....will use lead wire next time as others have mentioned, it's soft and malleable. The wire I used was a bit springy. Used PVA glue for the spacers on the pairs. The exhaust pipes (the Vector engines only came with intakes) were 0.8mm lead solder wire.