Knuckle assemblies are available with knob adjustment. Knuckles came with 1/4-20 male/female threads and lock ring.
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82-6060 - AC Power Transformer; 16.5VAC, 40 VA
16.5VAC, 40VA power transformers for security applications. Features a plug-in ground and auto-resetting overload protection. Mfr. #ELK-TRG1640.
82-8485 - Video Coax Surge Protector
Protects valuable CCTV equipment from high voltage surges such as lightning strikes and voltage spikes.
MCM Cat 57, Page 511
MCM Cat 56, Page 488
I've ordered several times from MCM and have always been very satisfied with their products, service and shipping.