I have two Schatz ship's bell clocks with the 2-jewel (14400 BPH) movement that I recently overhauled. The mainsprings and barrels were completely cleaned, greased and repacked as part of the complete movement rebuild. Both clocks have been running like a nose since completing the work, except they both lose time. After winding, they keep perfect time for the first full day. By the end of the second day, they're losing a minute, and I move the rate adjuster accordingly. Day three, they're running dead-on. By day four, they've lost a minute. Rinse-and-repeat the rate adjuster. By day five, they've both lost a minute again. It's Sunday, and my day to wind all of the clocks. Without changing the rate adjuster on either clock, I rewind them and note that they've now gained about 30 seconds in less than a day following a full wind. Smells like mainsprings to me, and yes, the mainsprings were tightly wound for who knows how long before I got them. I pulled, measured and mic'd the time-train springs. Both measure ~45" X 0.016" X 13.5mm. Merritts, Timesavers, et. al. don't carry a matching spring. Does anyone know if Hermle or another manufacturer offer a direct replacement for these old Schatz mainsprings?