I wonder why then the seller would be telling me I needed a longer shaft then? Guess I'll just have to wait until I get the Helicopter kit and the Head combo and make all the measurements. What is the difference between the two heads? just the length of travel is why it uses the shorter shaft?
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Looking on the amainhobbies website at the combo, the main shaft says it's 163.3mm.
http://www.amainhobbies.com/product_info.php/cPath/2_375_1498_377/products_id/227704/n/Align-600DFC-Main-Rotor-Head-Upgrade-Set
So then will I need the longer shaft for swashplate travel maybe? I dunno. What is the travel supposed to be on the DFC swashplate? Or maybe do I need to go ahead and install the head and find out what the pitch is on the blades that I am getting overall and see if the swashplate is travelling far enough to get the full +12 and -12 degrees of pitch respectively?