![]() The mainspring pressure will now be held by click C. This is done by pulling the clicks clear of engagement in the direction of the red arrows. To do this release both click A and click B to remove all mainspring force from the auto mechanism. ![]() Once this is done the auto bridge can be safely removed. ![]() When dismantling the watch movement the mainspring pressure must first be removed from the auto mechanism. This is only really required to hold mainspring pressure when the auto mechanism is removed during disassembly. Click B is holding the force of the mainspring during normal use. The second B is mounted on the Train Bridge and ensures the ratchet gear is held stationary when the ratchet lever moves anti-clockwise to the starting position of its clockwise winding stroke. The driving force is produced by the oscillating weight and transmits force to the lever via a curved rack on the end of the lever. It also allows the ratchet gear it to index in one direction only. The first A is mounted on the ratchet lever and transmits force to the ratchet gear during winding. The Omega bumper mechanism has three clicks A, B & C. I will however give a couple of tips on how to safely remove the auto-wind mechanism, before showing assembly of the cleaned movement. ![]() Apart from the auto-wind mechanism, the dismantling is fairly standard. I am not going to give a step by step dismantling procedure. Here is an insight into the rebuilding of an Omega Seamaster bumper automatic 344 calibre movement from 1952.
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