Does anyone have a diagram or 'exploded view' of the component parts of the key lock barrel and assembly for a Mk4 Golf? Or any idea of where I can get this info?

I'd need to strip my drivers door key assembly down but would like to know what parts are fitted, in what sequence etc, so that I can determine what parts are worn or don't work as they should.

Some parts of the barrel assy look damaged so I am wondering if the internal alloy castings have corroded a bit which is now causing the problems where sometimes the key won't turn in the lock properly. I don't have the barrels from the passenger door or tailgate to compare, as both have been de-locked.