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Nato Strap -> Casio F-91W Mod

Discussion area for watch straps, boxes, winders and other accessories.
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BostonCharlie
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Nato Strap -> Casio F-91W Mod

#1

Post by BostonCharlie » Sun Mar 10, 2019 11:39 am

The Casio F-91W is a lot of fun. Putting it on a nato makes it fun^2. The strap is a 20mm Ague which picks up the Casio's colors really well. I bought my F-91W from shopemco on eBay for $10 and it passed the CASIo authenticity test. They can occasionally be found for less.

The pins that hold the Casio's stock strap aren't spring bars. Look in the lug holes to see which side has the smaller end of the pins. I pushed the pins out by using a large unfolded paperclip and a pair of large pliers -- I pushed on this smaller end from the outside of the lug. Once you overcome the initial resistance the pin slips right out.

I made my nato adapters by fooling around with a couple small paperclips. My tools were a couple pairs of small needle-nose pliers. I trimmed the excess using small wire cutters. You can make out the design in the photo below. I wouldn't be surprised if a hard knock on the (now more prominent) case sent it clattering to the ground -- this isn't G-Shock country.

The open space between the lugs isn't visually appealing on wrist. Maybe if I sanded the hard edge off that lip it would look more natural.
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BostonCharlie
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Re: Nato Strap -> Casio F-91W Mod

#2

Post by BostonCharlie » Sun Mar 10, 2019 6:40 pm

I had a bright idea for how to easily fill that gap between the lugs: fill it with the strap end. I cut off the bit of stock strap made to fit in there and then carved a little slot on each end for the adapter. The adapters don't swivel much once they're on the strap, so I figured that the bit that wasn't carved out would keep it in place. We'll see how that works out ;-) The slots are cut so that the long, cut face of the strap end faces the back of the lug cavity (as opposed to the top or bottom) when the adapter is oriented downward -- like when it's on the nato.

The straps were harder to cut than I expected. It helped to get a fresh blade.

In this shot you can see that I almost left too much material on the strap. On both of my long cuts it didn't go quite as I expected -- the rubber is balky.
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Last edited by BostonCharlie on Sun Mar 10, 2019 8:20 pm, edited 1 time in total.
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Sporkboy
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Re: Nato Strap -> Casio F-91W Mod

#3

Post by Sporkboy » Sun Mar 10, 2019 8:14 pm

Good work on this. As popular as this watch is, I figured that there would be a 3D printed adapter for this model, but I couldn’t find one. I did see models for a pocket clip, desk clock, pen holder and a prototype hunting case pocket watch. A NATO adapter is long overdue. I will add this to my list.
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