I just started pumping one week ago with a Vacu-Tech 2.25x9 cylinder. I have read this forum, and also the Tigerpumping website and alot of what Big Al advises. My question is this: the literature that came with the pump advises to use up to 3-4Hg at first. I realize low level vacuum over extended periods of time are key, but I simply don't feel a thing until I get to 5Hg. Should there be very little "feeling" at this level and simply let the pump do the work? Or, as with anything else, everyone is different and varying the pressure as long as it is not uncomfortable? This would mean using 5Hg and maybe more, not sure as I have not tried that level. I've been doing two days on, one day off...3 ten minute sessions the first two days, then 4 ten minute sessions since then. A 30-60 second rest after each 10 minute session. In one week I see a noticeable change immediately after, and the effects are lasting longer with each session. I have only moved it up to 5Hg for 60 seconds, then back down to 3Hg for the remaining time of each session. I vary the pressure every 60 seconds from 2Hg-4Hg, and the one time at 5Hg. The 5Hg was in no way uncomfortable or painful. Do I use what is comfortable, or simply stay below the 5Hg until I have a few months experience. The changes are quite interesting thusfar. Thank you!