Michael Percy sells a product that HW-19 owners may want to try. It is made by well-known commercial isolation product specialist company EAR, and is named the Isoloss Sandwich Mount. It is intended for use on circuit boards, but the EAR Isoloss material has properties also well suited for turntable isolation applications. And, two of the sizes the Mount is offered in are perfect for the HW-19: about 1/3" tall with 4-40 threads, same as those used on the table's motor plate stand-offs; and 5/8" tall and in diameter, with 1/4-20 threads, same as the threads used in the spring suspension.
The Sandwich Mount has a short male threaded stud on one end (1/2", in the case of the 1/4-20), with internal female threads on the opposite, flat rubber side. Each 1/4-20 size Mount can support 12 lbs., so a set of four can be used with even a TNT platter-fitted HW-19 (whose steel/acrylic sub-chassis weighs 18.6 lbs., the TNT platters 15-20). And, the threaded male stud allows the Mount to provide height-adjustment/leveling of the suspended sub-chassis. Only $5.95 each---I think I'm going to order a set. I have the original, stock springs (with the little plastic top caps fitted with 3 ball bearings), a set of Herbies Tall Firm Tenderfeet, and SIMS Navcom Silencers, all of which I intend to compare with the EAR Mounts. Those interested can read about the mount on Michael Percy's website.
