I went to ACE Hardware and bought two 36" wood rulers and 20 feet of 3/16" clear tubing. Cost was about $6.25. Came home and took 1/2" plywood and cut a piece 1" wide and 36" long. The cut piece of plywood was about 1/2" narrower than the two wood rulers. I centered the wood between the two rulers, glued and screwed them all together. I ran the tubing on both sides of the rulers in the slot that the narrower piece of plywood provided, and used nylon zip ties to hold the tubing in place. I filled the tubing with the same oil that I use for the bike. It took about 30 minutes for all the air to bleed out. About an hour after starting fabrication I was balancing the carbs. It seemed to work very well. It is very sensitive to any adjustments made. I exchanged the tubes between the carbs several times to ensure everything was good.

Tom

Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety. Benjamin Franklin, US author, diplomat, inventor, physicist, politician, & printer (1706 - 1790)