Re-settable circuit breaker for Hunter Engineering BL505 bench brake lathe. There have been circular body and square body breakers used in these lathes. It is not un-common to have this happen to these breakers as they age.
Hunter Engineering 34-142-2 Four Arm Knob for BL505 Brake Lathe Twin Cutter Head
Hunter Engineering Brake Lathe Lock Knob BL500 BL505
Hunter Engineering Bench Brake Lathe Bits Negative Rake 221-580-2
Hunter BL501 & BL505 Disc & Drum Brake Lathe Operating & Instruction Manual
(10) Replacement bits - positive rake - 10 pack, HUNTER BL500, BL505, 221-640-3
Hunter Engineering DSP300 DSP 300 Switching Power Supply Hunter 511