J.W. Winco WD595 Thermoplastic W/Brass Insert Ball Knobs Tapped 38mm Diameter mm Length 7/16-14, J.W. Winco, Mfr#: DG115$7.35+
Star Grip, Similar To DIN 6336, D=M08, D1= 40 H=25, Internal Thread, Cap and Grip: Black Plastic, Kipp, Mfr#: K0154.208$3.79+
Hampton - Wright Products V670BL Universal Knob Latch-Black; 0.75 - 3 In., Hampton Products, Mfr#: 6834949$46.75+
Soft Touch Four Lobe Knob, 1/4-20 Thread Size, 0.625"L, Steel, Innovative Components, Mfr#: GN4C----4S2BS21$1.59+
Star Knob, 3/8-16 Thread Size, 0.625"L, Thru Tap, Steel, Innovative Components, Mfr#: GN6C----5S4--21$3.29+
Star Grip, DIN 6336 Similar, D=M05, D1= 25, Tapped Bushing, Steel, Black Plastic, Cap: Black, Kipp, Mfr#: K0155.205$2.95+
Zinc-plated steel threaded stud, VCT.53 p-3/8-16x1½-SOFT-C5, Elesa, Mfr#: VCT-p-SOFT (inch sizes)$6.15+
Snap Lock Four Knob, 1/2" Thread Size, 2-1/2" Dia., Innovative Components, Mfr#: GNH7-HEX4P7----$3.35+
Star Knob, 1/4-20 Thread Size, 1-1/4"L, Blind Tap, Steel, Innovative Components, Mfr#: GN4C----5S3B-21$0.79+