Main Motorcycle: '08 Moto Guzzi 1200 Sport
Join Date: May 2005
Location: Hudson, Ohio - USA
Other Motorcycle: 2012 Griso - SOLD
Extra Motorcycle: 1991 BMW R100GS
I use the 'fluid tube' you described, and it works very well.
If anyone here wants the plans, I'll post the link to a BMW Airhead site that provides it. I made mine a couple of months ago, and used it to balance the T100, W650, and will use it on the old Beemer shortly.
GBNF: 03 T100 Luc Org and Silv: 122/42 jets, TORs, 18T, UNI filter, no AI, Polaris bellmouth, Metz 880 tires, Prog. 440 shocks (105/150 springs), 11-1124 frk springs, Thrux frk caps, gaiters, MotoTwin bars, 6024 lamp, htd grips, 12v outlet.