Hey SWM, great post. Do keep us updated with your progress
By the way, do you have any pictures of the new max-vac extender without your mod? I couldn't find one on MNS.
V8: The big difference here is the vacuum type pressure that the silicone sleeve provides. It provides consistent pressure around your entire penis, whereas a string provides pressure in one area (where the knot is tied). This is why a string can be extremely dangerous (not saying that devices in general are safe, but string knots have left a few men on with ED for several weeks or more in the past).