Elbow grease
With our Italian friend I was concerned about the reassembly and tuning of the balance wheel and hairspring. I took my time making notations and boning up on rebuilding such a beastie. There are many new parts for me to learn about with this movement. Here's a well illuminated example of a similar one. Getting the hairspring, balance wheel, pallet and lever to all be correctly aligned and balance post-surgery was causing me to perhaps over-cram for the test. Finally I screwed up my courage and decided to do the disassembly and give this girl a bath. I worked slowly and took a lot of pictures. Many springs, levers, wheels, pallets and more to be realigned later. Finally got it all laid out. A visual inspection revealed a bent hour hand wheel. Careful application of flat pliers remedied that. The strike train mainspring slipped continuously when winding. Here's why. The mainspring had slipped off it's arbor hook. Might have been an earlier, slo...