@noromance
I used leftover Nobs springs directly to good effect.Those Nobsound springs are quite small, aren’t they? If you play with the search tool on the Century Spring site, you can find larger diameter springs that may suit your needs, which should improve stability. The springs I used under my subs are 1.75 inches in diameter and the springs under my main speakers are 1.625 inches in diameter. I am looking at their S-3031 springs for my general electronics, which range from about 20 to 30 pounds each in total weight. OD of those springs is almost 1.3 inches so they should be quite stable. The free length is 1.0 inches and compression rate is 20#/inch so compressed at 5 pounds they would be 3/4 inch long in service. They are good for a maximum of 12 pounds each. This seems to offer a good, wide range size for my electronics, which are also somewhat mass loaded so total weight per spring will probably range from about 6 to 8 pounds. Unit price of the stainless steel S-3031 is $5.63 each so in the audiophile world that is a relatively benign $22-$28 per component. In comparison, Herbie’s Tenderfeet are $14 each. If you order, make sure you get closed/ground ends.