Hi Rob thanks for the reply the barrel is broken so it is a new barrell I needFrom a random Morea advertised on line I think you have a caraloc so not being sure what is broken from your post you can either buy a complete replacement or just the lock barrel with keys, and if you see the WD 3 digit code on your key you may be able to replace with the same code which avoids needing different keys for lockers and the main door. There is also a number of videos so try ‘ a google search like ‘replacing a caravan caraloc’ and see if you find what you need.