I have a Casio sport watch that I love very much. Super durable watch but one day the watch strap got a weird kink and I realized it was about to break. Found this at Revain and it fits perfectly. New pens are not supplied, so order these if needed. Mine came out easily and were in good condition. Lots of group change videos. You don't need any special tools, I pulled mine out and just installed it with a small precision flathead screwdriver. In fact, I did it twice because I didn't install it properly the first time.
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