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Have you looked here. https://moleroda.com/radial-wheels-for-cleaning-and-polishing/ -
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The problem sounds very much like what might happen when failing to do the reset procedure. The stopwatch not working could be a few things. There are two different motors, one for the center sweep seconds and one of the minute counter. Damaging a coil is the most likely thing to do wrong when changing the battery, but that would likely just take out one of the two. So "start" it wait and see if the minute counter doesn't tick over. If that ticks, and you've done the reset procedure, it's probably damage to the sweep second coil. If neither works, then it could be the button contact is damaged. It's a tiny bit of copper trace on the PCB that curls around the edge to make a circuit and it can break off. There's a way to trigger the buttons from the small pads on the back of the movement, as well as check them with a multimeter, if you are familiar with one. But give this a try, pull the crown out to the second position and hold down button "B" (10 o'clock) for a few seconds. This is suppose to spin the minute counter to let you reset it to 0. If it doesn't move and (I assume) button 'A' (2 o'clock) doesn't start the chronograph, then either both buttons have failed at the same time or there is something else wrong. A leaking battery can take out the traces on the circuit board, and this can take out the motors and/or buttons, but you didn't say anything about it and it should be obvious if it leaked enough to do that. -
Perhaps not where you live, but here in DK, you get by the taxman financially quartered if you order from outside the EUSR. These center wheel weren't that expensive 5 - 7 years ago, around $45-$50. I guess stock is drying up and these days we have to pay with worthless confetti money. -
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