To remove clasp – using punch end of tool provided with your strap push through spring bar hole on outer edge of clasp to compress the spring bar.
Same procedure as above with buckle removal if the buckle has a spring bar hole on outside edge of buckle.
If buckle does not have hole on outer edge then you will need to use the spring bar end of removal tool and fit between strap and buckle and compress spring bar away and out of buckle.
Tip: always look on outer edge of clasp or buckle for small hole to aid in removal. You have much less chance of scratching your watch and /or damaging the strap using the access hole (if present).