Try as set of four Herbie's Big Tall Extra-Firm Tenderfeet to replace the suspension. The are the best that I've found for my HW-19 MkIV (TNT platter). The Herbie's Tenderfeet were a noticeable improvement over both the original springs and the VPI sorbothane pucks. It seemed like the sorbothane suspension literally sucked the life out of the music and I was ready to go back to the original springs when I decide to give the Tenderfoot suspension a try. The Big Tall Tenderfeet work out to be a perfect height for a drop-in replacement. For my HW-19, it turned out to be a significant but inexpensive upgrade.
