Following up in case this helps others. Once again customer service was very helpful and suggested that I order the correct diameter. Having the right size tube is very nice when retwisting the corkscrew back to the right shape. I did make a custom order with a longer corkscrew than my innerwear, which was very hard to use at first and it took me a while to find just the right place to cut it shorter. In the end I now have a full length corkscrew for home use (675 grams or about 1.5 pounds) and a shorter one with about 5 coils that I feel pretty comfortable wearing all the time (317 grams or 0.7 pounds). Given the lighter weight of the small one, I haven’t had it slip off yet, but I also tighten all the coils. And when I’m in “excercise mode,” I can wear the longer corkscrew and then screw the short corkscrew onto the end resulting in almost 1000 grams or 2.2 pounds of stretch!
My favorite part about the corkscrew is how easy it is to put on and take off! In seconds I can go from a weighted stretch to innerwear only maintanence. It is fast enough that I have used a public urinal without too much fear! I also have the autoextender weighted end caps (not a Stealth product) and trying to roll up the silicon sleeve cannot be done in public even when cut in half! Plus the weighted cap adds unnatural length and swing whereas I feel the short corkscrew appears quite natural. I see where others have said the full length is a bit too much to wear outside the house for most people, but my short version meets my every need!