I know that one of the sought after conversions to make the AP divers slow beat has been the Powermatic 80 movement ""cannibalized" from Tissot watches. This seems like a great fix, slow beat, new movement, 80 hour power reserve, and best of all, it's a direct drop in replacement. However, there is one big problem. This is essentially and "unfixable" movement. There is no way to regulate the timing as it's set from the factory, mine has plastic parts which may be OK, but over time may not