friend of mine has a problem with front door lock which is in a upvc door about 15 years old , removed lock today to have a look at it , when lifting handle to engage locking mechanism , handle will not lift , on removing lock its seems it locks in 3 place, but its seems top and bottom locks are not connected , can anybody recommend good web site showing different types of replacement locks , of lock is no longing aveiable what alternative can i do to help him any help would be apperiacted tyou