Prepare tools: professional strap remover (usually sent when you buy a stainless steel wrist watch or buy it yourself, do not use needle-like objects instead)
First of all, before preparing to remove the strap from SS watches, please look at the arrow on the back of the strap, there are arrows on the strap grain that is removable. Then, loosen the handle of the strap remover, after that, put the strap into the slot, and keep the steel pin of the strap remover aligned with the pinhole; the steel pin of the strap remover is in the direction of the arrow. Then tighten the handle of the strap remover inward, in the meantime, the steel pin (lug) connected to the strap will be ejected. Finally, use pliers to pull out the lug.
When assembling the strap, insert the lug in the opposite direction of the arrow, and the round end of the needle is advanced, that is the smaller end.