Alright, gotcha. This isn't a coupling nut, it's the 3 motor mounts and they're an integral part of the triangular Socenboz motor. They are indeed riveted into each of the three triangle 'ears'. The gear in the link is only required once you resort to drilling the original rivets to service the motor (which should be a rare, nearly unheard of, event on it's own). It upgrades nothing. It simply replaces the original riveted motor mounts, which are junk once drilled out. There used to be another good quality kit sold by an ebay seller from Israel, but it has zero effect on performance. I don't remember out the top of my head how the round motors mount and if the distance to the motor ledge carrying the mounting holes is identical to the triangular motor - so not really sure if this kit is as good for the round motor. I wouldn't bother with it anyway. There's nothing in it to improve performance. Actually, every-time somebody comes up with a plan to outsmart the original Swiss/German engineers, they come up with a new fu*&up, so I'd just leave it alone.