Emax 250 Nighthawk Pro landing gear(sizes for standard 3mm, polycarbonate 4.4mm, and 5mm arms)

7-8-2015 update
Added Mk8 gear, based on my own use and destruction of a dozen of my old mk7 ones, I beefed up the parts that broke and shifted the cross members. I will add a non-heavy duty version later if people want a lighter weight version.

I also made versions for the new 5mm arms and the older 3mm arms. Hence this is no longer ONLY for the polycarbonate arms. Note that MK 7 gear is strictly for the polycarbonate arms which are 4.4mm thick. All designs account for an average amo