So, tubes are just interconnected, nothing fancy there. I used connectors from fish-tank assembly.
Damping woudl be only by the diameter of those connectors, which is like 1,5 mm (or so).
Tubes - inside diam is (i think) 7mm, but not bigger for sure. lenght - around 1,5 m. And I did a "transition" for carb adapter (done from copper brake pipe with threaded at the end, you can actually se them on the picture) from another piece of tube of smaller diameter.
All in all, i just went the easiest way possible to slap the thing in place. I'm considering a pipe-bridge between the outermost pipes, but... my laziness may kill this idea
Now some practicalities - After i connected it and fired the engine I could see one of them simply going too fast up. I switched off, did rough adjustment, fired up again. When I had them moving slower, i simply carried on tuning till all stayed in place. At the end, though, I wasn't able to lock the screws with nuts, as this was putting the setting totally out, so since the screws are with springs anyway, I just connected a bit of vinyl pipe (for precise application) to black spray can, and "sprayed" the screws in place. it works - at least till today it did
Ah, and filled it with old oil - black and harmless enough if swallowed by the engine.
As per german manometers... let's say I'm Polish....
, allright, joking, actually I do believe in german quality. it was proven too many times.