@millercarbon are these the BDR cones you used?
https://www.audioasylumtrader.com/ca/listing/Accessory/Black-Diamond/-quot-stuff-quot/-see-pics/2093...
Worth the asking price?
Yes and that is a deal!
The three Cones alone will set you back $60 at Music Direct. The square Things are early versions of what became Round Things, both the same material but round is slightly better. Anyway doesn’t matter neither one is made any more since DJ died and so get whatever you can.
Basically the square Things are made of an extremely stiff, dense and highly damped carbon fiber/resin composite. They’re threaded 1/4-20 and this set has studs so the Cones screw into the Things. Then what you do is put three Things under the component with the Cones pointing down, and three Things under the Cones.
Same as I have with my turntable, amp and phono stage. https://systems.audiogon.com/systems/8367 Very effective. Only mine are Round. But if you look close you will see some square just like these. On the very bottom under my amp. BDR is so good it doesn’t come up often. Also those look to be thick. There were two versions, one a little thicker than the other. Thicker is a little better, especially under heavier components. Jump on it.