9 grams to 6 grams. On the left is the original and on the right is the modified version. I might get each cap down to 5 grams. The tripod uses 3 of them so that's a third of an ounce saved, and an hour of my time spent. Worth it? Not at all! This is to cap off the feet of a Sirui T-025x carbon fiber tripod that I removed the bottom section of legs from (as well as a couple pieces of foam and the center column).
These are Dorman vacuum caps.
These are Dorman vacuum caps.