This adapter clip allows you to use a 18mm NATO watch strap on the best watch in the world without bending spring bars or modifying the watch strap. You can easily change between NATO straps once this is installed. It has also been tested to work on a casio a158w (see note below) and the casio royale AE-1200WH. Slots have been added on the underside, so that it is removable in case you need to use it with a spring bar.
To install this adapter, you must first punch out the pin for the stock resin straps. Numerous youtube videos are available to show you how to do this. Try not to do this too many times as the pin will get more and more loose with each removal. Also be careful not to scratch up your F-91W with the pin tool like I did. Try to avoid using one of those double-ended pin tools because you won't be able to press very hard or use a mallet from the other end of the tool.
Customization is available for different strap sizes and lug widths - shoot me a message.
On the A158W, I've created another adapter that looks much nicer. https://cults3d.com/en/3d-model/fashion/casio-a158w-18mm-nato-strap-adapter-with-flange
The spring bar hole has been designed to be a teardrop shape to avoid roof sag from decreasing the hole diameter when printing with FDM. Print with this teardrop point facing up.
3D printing and wristwatch enthusiast, and designer of random things
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