Axles are of 2mm steel rod, 48mm long. Brake cross shaft of 1mm rod, 56mm long. Bogies secured with 8BA screws as pivots. Axle boxes opened out using 2.2mm drill for free running. Wheel centres opened out 2mm (possibly 2.1mm to avoid needing too much force when assembling - secure wheels with super glue). Bogie pivot hole opened our 2.5mm for clearance on an 8BA screw. Body underframe tapped 8BA for bogie pivots. Parts secured with super glue