Help if anyone knows the answer to this.... Im fitting the new 2312A motors to my 2312 shell (old motor type) but their are 4 plastic raised stubs on each prop arm that stop the motors from going to the mounting possession.. Does anyone know if i can just snap these off and all will be ok? or do i need a new shell? what are the new shells like if i had one? do they not have these stubs? are they just flat to the mounting holes?