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This fine set lets you upgrade your 1:72 AH-1G Cobra kit (later models too) with a rotating rotor and a detailed main transmission and rotor mas, too. Especially handy for the very nice Special Hobby 1:72 Cobra kits that have you glue the rotorin place making it prone to damage. I decided to remedy that in my model. By hiding a poly cap inside a detailed model of the main transmission the rotor can be rotary (shouldn't this be obvious?) and removable for painting or transport. The mast is designed so that a 2mm metal axle can be used for strength without compromising the detail of the swashplate and rotor controls.
This set has two main transmissions and two rotor masts - because printing it this way costs the same one set would cost - you can share with a friend or build another one or have a spare.