[EdHornby]

only just seen this thread but I dive on a twindies rig and what Mattbin has said is spot on

for reg stowing I have a plastic line clip on my chest D ring and clip the reg not in use onto this - easy enough to get to for you and your buddy if they need it

http://www.scuba.com/images/bc/ISTBCHoseHolder.jpg

 

[EdHornby]

ooh yeah - put the bottom set on first, this holds them still so that you can faff with the bc/wing to the right position