i am almost sure that you will find it is nothing to do with the lock or tumblers, it is the door lock itself that wears, the friction of the moveing parts inside the lock make the working parts loose thereby fouling the up and down movement of the operating rods that lock and unlock your door,
go to your local breakers yard as i have done with my last four customers, tell them you want a door lock, not key lock,
a little care, prise out the gromets securing trim fixings, remove holding screws, prise away horse shoe clip from behind window winder, remove any cables going to speakers in door,
gently prise away door pannel one plastic gromet at a time,put aside, never force any thing that will not come away easy,to remove plastic cover go arround edge with sharp knife as this has been sealed with mastic that when removed with care can be used again later, peel back half of the plastic covering to let you get at the door lock, remove two bolt that secure the lock cover stay, you will find that this to is sealed with mastic but is also plyable to use again later,remove the two operating rods from their gromets in the lock by gently pulling to one side, remove the three retaining screws holding the lock in place you can see these from the side of the door, remove lock complete with cable to pull handle, spray inside new lock with wd 40 before installing.
this may seem a bit of a pain to do but with a little care will only take you an hour at the most, and remember no one asks how long it took but how much did it cost, this is one hell of a way to save on a very common fault. take your time,
honestwelsh
honestwelsh, January 2008
