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Hi all, I managed to get my hands on a vintage 1972 Tissot Seastar Automatic with a 794 movement. It's given me a few challenges along the way with the calendar mechanism and no technical sheet to refer to but I seem to have overcome everything until the last part of the assembly. The date wheel is advancing fine now, as does the day disc when light pressure is given with pegwood when I rotate the crown. However, my question is, what holds the day disc centralised and in place? I've worked on an ETA 2836-2 date/day mechanism, and on this, a circlip held the day wheel on. The design suggests with this one that the dial alone will provide enough pressure to hold it in place though I'm not convinced. I've invested in a new date ring and day disc due to the originals being badly damaged. Has anyone worked on one of these old Tissot movements before who could kindly offer some advice on fixing the day disc please? Photos of the job added. Many thanks, Adam