multipoint locks are now very common and are often fitted to most types of doors including PVC doors, patio doors and even wooden doors. Replacing a multipoint lock can be a difficult job if the door lock fails in the closed position. In this example I was lucky and managed to open the door in order to replace the lock. The cost of a full lock was £50 from my local locksmith who ensured I got the exact right model and also trimmed it to the correct length. If your multipoint door lock fails your door will not unlock and the door will not lock so this job needs doing urgently. Brought to you by http://www.ultimatehandyman.co.uk