Thanks yall, good input, seems mostly that the best reason is that they dont work, I was expecting more reasons like they might get knocked off, not sure about having to twist tanks to see them, will observe that next dive. I have switched totally to sidemount because of a shoulder injury which limits me reaching my back valves, and in open water ocean rec dives I have used the antenna style, but in cave I dont think I like that option. Bending the hose and tying it off is the way I usually do stages with doubles, but that does stress the hose some so it could be argued against, and yes hp leak doesnt lose a whole lot of gas, for deco its manageable, for primary gas with two tanks sidemount in a cave it would be a bit different, but of course you could change regs to the other tank, but with proper gas management its maybe not necessary, unless multiple frickups happen with your buddy's gas too. All in all, a 7 inch hose and regular spg and reach around and bend it up and look is probly best option and my motto is why carry lead when you can carry tools, so a wrench and extra hp and or lp plug and such would be nice in the razor butt sack. So if it aint broke dont fix it, or like my brother the plastic surgeon say "the enemy of good is better"!!