you can always do the "cheap fix" we all did back in High School -
drill a hole between the two sandwiching metal parts and the rubber mount (through all 3 parts) and place a long bolt thru it. put a lock nut (nylock) on the bolt but don't tighten it down tight, let it have a 1/2" - 1" gap between the nut and bottom metal plate.
this way, if the mount lets go, the bolt catches everything, but you still have the benefit of rubber mounts if you don't want any potential vibration.
(but with well balanced motors - vibration is usually minimal).
just another option.
Dave Harris
drill a hole between the two sandwiching metal parts and the rubber mount (through all 3 parts) and place a long bolt thru it. put a lock nut (nylock) on the bolt but don't tighten it down tight, let it have a 1/2" - 1" gap between the nut and bottom metal plate.
this way, if the mount lets go, the bolt catches everything, but you still have the benefit of rubber mounts if you don't want any potential vibration.
(but with well balanced motors - vibration is usually minimal).
just another option.
Dave Harris