Habitation door lock

Have problems with my habitation door lock ,got the damaged barrel out and ordered a new one from Hymer ,still struggled to get the new one in as it was a couple of mm from seating properly .Ken also tried at Uttoxeter but even his expertise failed (and mine ) anyhowe i put the question to the hymer forum on Facts and Premiermotorhomes who are now hymer dealers came up with this remedy (i hope as i haven't tried it yet) within minutes.
Good evening Rebbyvid, 

Brownhills are no longer a Hymer appointed agent, and have no parts access; they purchase their parts through another UK dealer. 

You can locate your preferred Hymer dealer here: 
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The installation of a replacement barrel only requires the matching key to be inserted and you will not then see that all the pins become flush with the barrel apart from a sprung one right at the end. This last pins stops the barrel being removed and controls the rotation travel. Aim a torch down the housing and you should see four shafts running inwards, three will stop at ninety degrees however on one of these you will see that there is a little slope at the end which upon insertion of the barrel the locking pin will depress in to the barrel and when the barrel is pushed in all the way will pops out and stops the removal of the barrel. 

It is not possible to fit a barrel with the removal tool as these keys drop the locking pin back within the shaft of the barrel and enables it to be removed. 

Have you tried fitting the barrel with your key, and are all of the pins flush bar the last one and did you locate the special shaft in the housing to locate the last pin with? 

Regards, 
Chris

Get your torch out Rob
Hope it works

and magnifying glass 

Oh and do it when its warmer, was frozen when I got back in the van after trying

Hia

All sorted now the main problem was the lugs on the barrel were not lining up so i removed the door panel to get a pair of  pliers on the lock and that solved it 
So Chris @ Premiermotorhomes info was spot on and this was where a large forum can come in handy even though it has a lot of arguementive members 

I think thats the problem we were having Rob as we had all the pins down but it still wouldn't go all the way in, glad you have a working lock now