The ZN-HKIII has replaced the ZN-HKII. The base thickness has been increased from 1/2" thick on the ZN-HKII to 5-8" thick on the ZN-HKIII. The ZN-HKIII weights approximately 3 pounds.
The ZN-HKIII has been designed for the finesse operator as well as the heavy hitting brass pounder. The center of the knob is directly above the centerline of the rear feet of the base making it is resistant to tipping.
The ZN-HKIII features 6 ball bearings, silver contact points, spring for return, knob with skirt and stainless steel screws. The adjustment screws for contact spacing, spring tension and lever arm angle are 8-32 stainless steel thumb screws with knurled nuts for locking. It is built on a 2 1/2" x 6 1/8" x 5/8" steel CNCed base and weighs 3 pounds.
The ZN-HKIII is wired with a 1/8" stereo plug wired to tip. You may have to change the plug if your rig has different requirements.