![]() The teeth of the brass ratchet wheel riveted to the underside of the fusee cone engages in the steel paws when it is together, the click springs providing the engaging pressure. (note - fusee verge watches usually only have one paw/spring). Then separate the bottom brass main wheel from the steel wheel containing the two small steel paws (or "clicks") held by click springs. Once the pin is removed the collar lifts off so the components can be separated: There's a blued steel collar with a brass pin through it holding everything together & this pin needs pushing out - occasionally they need a bit of persuasion with some light hammer knocks but I try to avoid hitting anything unless I really have to: ![]() (Apologies for not great quality photos - I find my iphone is quickest for photos & uploading but have some blurring)įirst here's the intact fusee, upright & bottom views. 20th Century mainspring steel was so much better quality that these variations eventually became null & fusees became redundant. ![]() They really were an ingenious and elegant solution to early mainsprings varying in their power output depending upon how wound up they were causing variations in timekeeping ability over the overall timepiece. I'm just in the middle of an English Fusee Lever Pocket Watch restoration & thought I might share the fusee dismantle so readers unfamiliar with them could see what's on the inside & how they work.
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