Amazfit Watch faces

Does ayoe know where to purchase the screw tubes that hold the watch strap on? In changing the band I lost one screw and need to buy new ones (hopefully in the US to save shipping time) Thanks.

I can't translate the video that xeroxero recommended. What kind of tool and how do you remove the strap pins. I would like to put a metal strap on my T-Rex. It appears that the casio metal straps for the g-steel watches may fit. It that what you meant by GST strap? Thanks