help with a damaged component, phantom 3

[oprean]

Hi, to start I got a Phantom 3 professional and the first time I used it it got stuck in a tree, fell to the ground and got a bit damaged, not much, the camera wouldn't calibrate properly, the damage was minor, a loose screw that held camera aligned properly to the vertical bolt as I later found out, but the major damage was done by me when taking apart the gimbal PCB assembly, a small washer held the vertical bolt in place was what I though metallic, but later found that was a magnet, I broke that piece with a pair of pliers, now without it in place the camera gets stuck calibrating, and with it glued together the camera calibrates askew. Now I know I'm at fault and probably need to buy the whole camera assembly to replace it, but if somebody can give me advice on if I'm wrong about what is broken, where I can find a cheaper space part, if I can even replace it without specialized tools, or anything else that can help me I would be grateful. Thanks in advance Images below
Bolt without the washer: http://i.imgur.com/EyswNEC.jpg
Bolt with the washer in place: http://i.imgur.com/2s80WQw.jpg
Said washer: http://i.imgur.com/kdogVXE.jpg