Only ever had one watch that nearly defeated me when trying to put the back on again after a battery change. I ended up using a large socket that was just slightly larger in circumference than the glass face; I also wrapped the socket in a cloth for extra protection, then placed the watch in a vice and slowly clicked the back into place. Using a vice meant that the load was spread evenly across the whole watch and I could control the amount of pressure needed to clip it all back together.
Most backs I've got off with a watchmakers screwdriver, but there are a few that I use a cheap imitation Swiss army penknife to pop the back off. I know it's an imitation one as it's useless at getting stones out of horses hooves ;o)
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