This kind of post drives me crazy. I know there are other AZ'ers out there who update their own houses, work on their own vehicles, have fix-it oriented hobbies like me and are familiar with at least as many tools as I am, but they also don't want to share ideas, I suppose, because it makes them look "cheap" -- which I am, and that's why I own the nice collection of cues I own cause I don't waste the money elsewhere.
Listen, you can go to any full service specialty tool/hardware store (an old-fashioned full-service Ace would do just fine) and buy any number of metal/plastic or man-make fibre collars in an unlimited number of interior diameters, line them with one-sided fuzzy tape (any full-service craft/hobby store carries a dozen funky types of protective tapes, like Michael's, for instance) and create yer own to test with for about $1 apiece or so, and get the weight that fits your needs.
Looking at Mike Massey's design, I'm baffled why someone would design a weight which would force the user to hold the cue in a particular way to use the device. Doesn't designing an evenly balanced full-collar device sound more reasonable and useful?