The locking part of my door lock is so stiff the key will not turn it from the outside. The latch is fine and the door opens easily from the outside. I can't see how the inside part is attached and before I force something does anyone know where the hidden fixing screws are and is the inside knob a push fit?

Dave, March 2009

It could be that the mortice that the lock is trying to go into on the main caravan frame is not lining up properley with the catch when closed.This or the door may need realigning.Probably the cause if your finding that the door lock key is working smoothly when door is not closed.
Its worth a look
sIMON

SIMON, July 2012

There should be four screws around the inner part of the lock undo these and the whole lock comes off.
Ensure you first mark the position of both inner and outer sections of the lock so it goes back the same way. It might only need penetrating oil squirted in the lock barrel through the key hole. Try that first.
If there's a small plate over the key hole insert the key enough to open it then squirt in the oil. Push the key right in and work it until it turns free. If not then remove the lock and purchase new barrel section.
Give the lock/s a squirt of oil every couple of months.
All locks outside. The jacking points also, don't grease them or dirt from road will build up on the thread making them hard to turn.
Once done try locking and un-locking the door while its open. If you have a window within reach of the door leave that window open or a larger one if not that you could get in through. Why? I shut my door after replacing the lock and couldn't open it from the outside the handle would not turn fortunately left window open and reached in opened the door, I had put the lock on wrong.

Bob, March 2009