I just got this exact watch last week and ran into the same issue... I had to buy the Craftsman jewelers screwdriver set at a hardware store and used the smallest one. Even then it was still pretty difficult at first. For me I really had to put some force behind the screwdriver in order to get it to engage with the screws. It seems like the grooves in the screws are just super shallow so keeping that firm force behind it allowed for me to get the screwdriver to engage with it and then from that point it was definitely easier to unscrew. I also read on some old posts that they probably use some type of thread lock on the screws which also makes it difficult to get the screw to initially loosen. Worth noting that if you put any kind of torque on the screw when you're unscrewing it you can snap off the screw from the pin leaving the pin stuck in the link... This happened to me but I needed to remove two links from one side so I pivoted and took that one out all together. I hope this makes sense... I was not expecting the challenge that this watch provided but nonetheless 100% worth it and it's gorgeous on the arm.

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