Broken zips can be a right pain in the rear end, in this Instructable DoomMeister shows you how to effect a repair to a zip (zipper to all you Americans out there) that has one of its teeth missing.
In a country like Blairstrip 1 you need a good raincoat and DoomMeisters favourite one has a broken zip. Rather that buy a new one as the corporate overlords would have us do, or indeed to fully replace the zip DoomMeister will repair the missing tooth using his awful sewing skills and a piece of a cotton bud (Q-Tip).
Step 1: Reassemble the Zip
If the slider has come away from the teeth of the zip as it will be prone to do if a tooth is missing, reassemble the zip by pushing the slider back on to the teeth making sure to get the tape smoothly and un-kinked between the groove in the slider.
Push the slider as far away as possible from the missing tooth whilst you are working.