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Message: <blockquote data-quote="thor447" data-source="post: 3951413" data-attributes="member: 24867">Here's a few closer pictures of the rear of the watch before beginning.  In this first pic it shows a good example of the column wheel.  You can see it in the center upper-half of the photo.  It has levers from the chronograph start/stop, reset, and hammer all interacting with it.  When you interact with the chronograph, this wheel engages and disengages all of those different levers in the proper order to make the mechanism function.[ATTACH=full]341359[/ATTACH]Pic of the lower half of the rear side before starting.[ATTACH=full]341360[/ATTACH]The movement disassembly on this 6138 model begins on the dial side. At the very front is the calendar works, which is what controls the day and date wheels shown at the 6 o'clock position on the dial. Here are a few pics showing the disassembly in sequence.[ATTACH=full]341361[/ATTACH][ATTACH=full]341362[/ATTACH][ATTACH=full]341363[/ATTACH]The mechanisms for the keyless works (parts for setting crown in multiple positions and winding), motion works (setting time) and the hour recording wheel for the chronograph are also on the front side of the movement.  These are separated from the calendar works as shown in the photos above by the chronograph plate.After the calendar works components were removed, the next step would've been to take off the chronograph plate.  When I first got the watch and was inspecting it, I could not get hour or minute recording wheels to reset to the zero position. In the photo below you can see part of the hour recording wheel mechanism.  The wheel is driven directly by a gear and clutch assembly on the lower barrel arbor itself.  It is puts constant pressure on the hour recording wheel to turn (very light amount), but if the chronograph is not turned on, there is a brake that rests against the edge of the wheel.  When this break is engaged, it creates enough resistance on the hour recording wheel that it engages the clutch on the barrel arbor.  When the chronograph is turned on, the brake is released, it disengages the clutch, and the hour recording wheel begins to rotate.  In the photo below, there is a cutout on the chronograph plate that allows you to inspect the interaction of the brake and hour recording wheel.  On this watch, the brake was sitting underneath the wheel, and not on it's edge, thus throwing everything out of whack, and is why the wheel would not reset.[ATTACH=full]341364[/ATTACH]This was a few of the issues I found during disassembly which unfortunately shows that this watch wasn't assembled and adjusted correctly when it was previously worked on by the last person 30 or so years ago.</blockquote>

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