Phantom FX-61 Motor Extension

**Update
I had a little trouble trying to get the inner most holes on the stock motor to fit so I fixed it so that its easier to fit. I also found that a 24mm extension works best for 30 mm screws with one washer.
Im also including the SketchUp File, so you can make it any length you want.

This motor mount will extend the Zeta Science Phantom FX-61's stock motor mount to either 20, 23, or 25 mm.
Why did I make and print this:
There are two reasons. 1. I use my plane for aerial mapping and have a heavy camera in the plane, to compensate for the weight, I decided to move the motor back. 2. I also read about people breaking motor mounts on landings (I never experienced this). The solution was to add a folding prop. The problem is that a folding prop will not clear the tail section of the fuselage. so the motor has to be moved back. I didn't want to be out in the field and have this happen, so I decided to add a folding prop.
Im using a AERONAUT CAM 9"X7" (23X18 CM) and