On a siphon cabinet at an old job I always had to do the finger thing. Then I copied the air setup from the Zero Blast N Peen we had at school. It had a small aux air line right after the foot valve that went down and kept things mixed up right at the siphon tube entrance. Worked like a charm. I put in a needle valve to adjust the flow. I haven't done this to my present cab, because the air valve is on the gun, but I will, someday. It gets old unclogging the tube. And even with super dry air it seems like some things just like to pack up. I miss the foot valve, too. Gets old holding the trigger all the time. Projects, projects. the more I finish, the longer the list becomes. Reading this stuff just reminds me of more stuff I should do.