3DR RTF Quadcopter - setup install

Hi, couple beginner questions on the RTF quad. After getting stick time behind the v202 I purchased the RTF kit because of my remote island location in the middle of the pacific. It's 2000mi over open ocean to the nearest hardware store which makes things a little more difficult... and shipping takes a month min. The good news is there's nothing to hit but water  :D

I have the blue motors w collet prop adapters. When I put just the clamp (collet?) part on the shaft of the motor it doesn't automatically straighten even when I tighten with all the other prop and bits. I've tried to eyeball it and then install bits but when I spin by hand I can see it's still off center.

Am I required to cut the shaft down? There's about half of the shaft still visible when the collet is fully placed.

One of the motors I can feel a slight shaft play but only during half of it's rotation. Sort of like a single bearing is loose inside. How much tolerance should there be on shaft? The other motors are tight (3 remaining  on quad, and the 2 exrra I purchased.

How hot should the video TX rx1260 get? I have only plugged everything in to test and within about 5min it was too hot to touch. I had antennas always installed on both ends.

Anywhere I can find installation info on the camera gimble? Can't seem to fit it anywhere with a 2200mah battery mounted.

Thanks for any help on this.

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