This DeBruce 400 day clock is almost identical to the previous one I repaired (see DeBruce 400 Day Clock by Kundo, 1950s). The dial says DeBruce, and the back plate says DeBruce Watch Co. Kundo made the clock.
Repair job 6129. Cleaned, new mainspring (Horolovar 19 x 38) and new suspension spring (Horolovar .0032 inch).
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I have a De Bruce 400dayAnniversaryClock. I ordered a suspension spring unit for it 3C as the book required. The suspension seems to long as the bottom of the balls touch inside the control cup on the bottom plate. why is this. when I shorten the spring the clock runs to fast. what am I doing wrong Curtis Lyons