Possible Clues:

• Bar that engages with a ratchet
• Ratcheting catch
• China casing tungsten safety catch
• Machine part connecting to a gearwheel
• Lever in hand — not the right
• It engages a ratchet wheel
• Part of a ratchet wheel
• Ratcheting wheel mechanism
• Trigger-to-cylinder connection
• Ratchet-wheel engager