Right.... here is a pictorial story of me trying to mount the Moon Unit Mounting Ring.
http://www.flickr.com/photos/25234883@N02/8008938339/in/photostreamHere is our three main protagonists... me (hand) the flash unit and the ring! Let us begin... please excuse that I have named the following two files in not consectutive order.
http://www.flickr.com/photos/25234883@N02/8008955262/in/photostreamI align the ring in the way in which the ring appears to most efficiently fit on the ABR800.
http://www.flickr.com/photos/25234883@N02/8008943068/in/photostream.... and we are in! The ring snuggly slides over the ABR800....
http://www.flickr.com/photos/25234883@N02/8008958979/in/photostreamAnd here we are the ring is over the ABR800.... this side fits flush (remember I have the same problem with 2 x rings and 2 x ABR800).....
http://www.flickr.com/photos/25234883@N02/8008958379/in/photostream.... but wait! What is this.... this side does not sit flush.
http://www.flickr.com/photos/25234883@N02/8008960360/in/photostreamGive it a wiggle.... oh, wait this looks promising (actually this is as promising as it gets - if you look closely it is still not fully flush - see below - but to the untrained eye it appears good so.....)
http://www.flickr.com/photos/25234883@N02/8008959469/in/photostream.... lets try to rotate.... nope, locked solid.
http://www.flickr.com/photos/25234883@N02/8008920804/in/photostreamIt appears to be jamming on this left hand side. The ring is not actually flush and the groove is not aligned and the ring cannot rotate.
http://www.flickr.com/photos/25234883@N02/8008919988/in/photostreamWriggling it causes this side to drop and accentuate the ring flashes inability to sit flush.
http://www.flickr.com/photos/25234883@N02/8008919066/in/photostream.... and this where the story ends. Jammed and not sitting flush again! I stop my photo-story here because this covers the basics, repeat this frustrating story over and over again for hours.
It might not always go in this order and it might sometimes look up and then down again. But what you can guarantee is that this ring does not mount, on both heads and on both rings.... it is just frustrating.
I hope it is me being a dingbat, but actually I am trying different things and doing the necessary reading.... it is not as simple as a) it should be and b) the price tag I paid dictates that it should be.