The best thing about your project was the fact that you had some fun! Sometimes we forget....
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I didn't weigh it but I would guess around a gram or two. The AT cartridge started off light at 6.5 grams, so the extra weight was a non-issue.
My best guess is that it tamed the resonating frequency and created a better bond between the cartridge shell and the arm. Without running test it is hard to actually say why it improved the sound but it did. Also, it didn't cost more than a dime to install since I already had some along with a heat gun. If I didn't like the results I could just remove it.
I would caution others to beware of the high temperature of the heat gun. You don't want to transmit the heat to you cartridge or directly heat other parts that could be damaged.
I wish that I had a Grado Platinum to see how much better the table would sound with an even better cartridge than the cheap AT. Before the wrap I put the Glider on the table and noticed an improvement so I would assume that the wrap would even allow better performance now. Maybe I can try it out with the Glider/wrap before sending it out. If only the clips on the WTRP were less fragile so I didn't have to worry about breaking and resoldering them.
My suggestions for anyone else thinking about doing the same is to look for the following
Qualities in a table:
1) Belt Drive
2) Solid Plinth, nothing made of plastic
3) Decent tone arm with bearing that are smooth with little to no play.
4) Simple design. The less the table has the better to mod. Something that has all the bells and whistles, i.e., computerized fully automatic controls is less desirable than fully manual. You basically want to remove all variables that may negatively affect the sound, so just having a motor, belt, platter, plinth and arm system leaves you with ingredients that can result in a greater sonic outcome.
5) Have fun and experiment.