This dual-ended spring bar removal tool can remove watch strap quickly and easily.
Insert the fork end between the lug and the strap and seek out the small ridge on the springbar. Pull back the tool and ease out the springboard which releases it.
To change a buckle which is held in place with another springbar, insert the pointed end into the hole on one side of the buckle joining point, and push in which will release the buckle. You may need to assist the removal by slightly twisting the buckle against the strap.