I see a lot of talk on re-filling and losing juice. Here's how I do it. Leave the tank on the PV. Pop the top off and fill up. Now put the top cap on just up to the o-ring. Here's the trick. Find the carto hole, and tip the PV on it's side until you have the air bubble hovering directly over the carto hole. Now while holding the tube, push the top cap on all the way. The air will be displaced through the carto hole and not the juice, or very minimal juice. I do this ALL the time and never lose any liquid and very rarely have to blow through the carto.
Just to let everyone know, the lathe is in pieces now, so I won't be able to make any replacement tubes until I get it back together. Hopefully by then the new material will be here and I'll be turning them out a bit quicker. The new spindle motor showed up today and she's a behemoth!!! I can already see my torque problems are history. Kind of like when I dropped the stroked big block in the Mustang no lack of torque there either.