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regarding using only 1 grub screw
I noticed that one of you mentioned that you are supposed to use only one grub screw to hold the tail on the shaft in a metal tail system. Why is that if you can use 2 than why not use them.
I just got a metal tail case and in my Rappy, and doing low hovering, the tail suddenly beang piroetting and I too got lucky and was able to land with no damage. Upon inspection I noticed that the rotor assembly was loose on the shaft. There was only one grub screw holding it on and it was loose. Well, I tightened it up and added another grubb screw to the opposite side. Is this not O.K.???