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For the last several months I have been enjoying flying my quadcopter with the motor shafts reversed.   This has proven to lower vibration induced issues with the onboard Gopro and has also proven to remove the overall twitchyness of the craft.   The effect of shaft reversal and mounting the bulk of the motors mass below the boom dramatically reduces hoizontal torque available to the motor; reducing tendency to vibrate.   Mounting the motor in this manner also allows you to easily remove the bell housing in order to inspect and clean out the internals. 

For those that are interested, I have include some brief instructions to perform the shaft reversal.

1.  My motors mostly consist of the stock motors provided from jDrones.  However this procedure should work for most other motors also.

2. Start by removing the circa-clip.  You won't need this for reassembly, however hang on to it should you wish to restore the shaft position.

3. Remove the grub screw.  Ensure you don't let this bounce away and get lost.

4. Seperate the two motor halves.

5. Using a vice or plumbers flaring kit (ideal), press the shaft through to the opposite side.

6. Re-assemble the motor by re-combining the two motor halves.

7. Mount motor and propeller to boom.