There are four links on each side near the clasp of the accurist strap, these links have split pins that can push out. On the back of the strap is an arrow on each link showing the direction to push to get the pins out. One end of the pin is the split end - it looks a little like a screw head but it isn't (don't push this) the other end is rounded (push that).
You need a good awl (pointed metal tool) as they need a fair push. Rest the link on the edge of something (like the instruction book) to brace against, with the pin hanging over the edge.
Take out two pins on either side of the link you want to remove. The link that fixes to the clasp is special so that one stays in place. Remove the link or links (it is best if you can remove one from both sides to keep the central position for the clasp).
Join the sides of the strap up again and push one pin back into the hole *the same way round as all the others*, inserting the split end first and finishing by pushing gently on the rounded head of the pin to secure it.
Duffbeer, May 2007