Dang it Marv!!! AGAIN, you are a step ahead of me on this, LOL
I just got my Thien section fine tuned today, have a plan for a mobile set up that was going to be a variation on what you did, but then I was gonna come in w/ the sneak-attack boom arm, so I could get my 3-pt shot contribution to this thread, just like Steph Curry.... But NOT!! Just like Steph Curry tonight, shut down
Mini-Review of Rockler's New Small tool multi-adapter 2-1/4" hose + adapters kit
FYI, I just bought one of Rockler's new Small tool multi-adapter 2-1/4" hose + adapters kits, the one w/ the black slinky hose and the blue adapters (~$40).
The hose is very pliable, which is nice, but they accomplished this by making the hose from a double-walled vinyl, like a slinky inside another slinky but w/ opposite twists, which is quite heavy and not elastic despite the double helices supplying the flex. Let me be clear, the hose itself stretches between 3' - 10', which is quite good and helpful, but that's accomplished by the springs and not the "fabric" of the hose. That means the hose doesn't have a very tight grip on the adapters and I am concerned about the long-term health of the hose just away from where it threads onto the adapters, as there can be a lot of flex there and the vinyl is clearly under quite a bit of stress -- time will tell.
The blue adapters are thick silicone, so they are pliable, but their range of stretch/elasticity is limited or is going to take a very, very strong hand of persuasion to connect to some tool fittings. This means they aren't supple enough to form a tight, well gripped seal in many situations, and will pretty easily slip off unless they can be seriously manhandled onto the tools' nipples. The adapters do have a swiveling connection and that is a big plus.
This adapter stretch issue leaves lost middle ground between the 2 natural sizes of the adapters. I'll try to use soapy water to get the small adapter to somehow find some middle ground between what the smaller seems likely to fit and something that's smaller than the bigger adapter's minimum size. Rockler is considering selling the adapters as solo pieces. All-in-all these are a good first whack, but there's definitely room for improvement.