also there have been two thread recently about some low profile nut for the backplate, which i found one of them but not the other. So anyone (Stefan), who knows all the threads by heart where is the other thread.
This is the one i found
http://www.rebreatherworld.com/rebre...late-nuts.html
and the otherone, i believe it was someone who bought these nuts from portlandoceanering, but there were some other recommendations as well. And some pics in the thread.
/Jonny