RE: Post all your
Terry, yes it is common practice to use a rear support for in-runners, however, the Advance (yes, an in-runner) is configured more like an outrunner with a a large base/mounting plate area that goes against the nose ring plate. It is also a small nose ring, the Advance barely fits into the nose so there is not much unsupported area outside the motor mounting plate. The entire nose of the Spark is carbon fibre too.
After I installed the motor, I gave it the ole 'grab a prop blade and pull hard/twist' test (highly calibrated BTW) and nothing moved so I did not install the rear support.
I believe the new Angel Shadow is also set up this way.
Like I said, so far no problems.....
Woodie