@rose yeah i think the pins in the wriststrap aren't spring loaded or something like other watches with replaceable straps so the process is you have to align the pin with the holes and make sure it goes through the whole strap.
that being said though you might be able to find replaceable spring loaded ones but you'll probably need to find f91w specific ones?? i think ??
@rose i know on those watches its kinda annoying because they're not standard but i think you can get a kit of something to convert them?? its been a while since i looked into it
@rose oh black transparent case?? the inverted displays are sick as hell. i wanna do some stuff with mine too with 3d printed parts but dont have a printer yet