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Are you sitting comfortably? Then I'll begin! A while back I bought myself a Favre-Leuba quartz watch with an ETA 555.415 movement to add to my small F-L collection. It was a non-runner but that wasn't a particular concern. A new battery made no difference so okay, display only. More recently I bid on and won a going ETA 955.412 movement. I had misremembered that I had a 555 in the watch, not a 955 as I thought. No matter, I would swap them over. The first thing to tackle was the date ring as the donor date was at 6 and the recipient at 3. With the aid of Mark's excellent video I exchanged the rings although when I changed the date it felt a bit stiff, despite a dob of lube on the ring teeth. I should say that in the interim I had a crash course in tweezer wielding and sudden undesired launching of very small parts into the ether. An LED torch and lots of hands and knees were all that was required to remedy the matter and I only had to search for the same part twice. Again, no matter. So I put the dial and hands back on, set it all in the case and added battery. Bingo, the watch went! It was only after a few seconds that I noticed that the second hand had a nervous tic! This is the bit that has me stumped. The second hand moves once every four seconds! I know this because every time it moved it jumped four seconds - hence 'Fifteen times a minute'. Suffice it to say that the battery was removed and I contented myself by entirely disassembling the 555 movement for practice. Has anybody any understanding of what's happening? The 955 was going quite normally before I mucked around with it! Cheers John