你好,I’ve just had a front door fitted and when you turn the key it grates as it’s turned ,I’ve mentioned this to the company and told them that my other door locks don’t do this .They have said it’s a different mechanism to other doors but as far as the mechanism goes it looks the same locking system but as far as I knew the key just turns the barrel lock locking the mechanism in position,in my opinion it is the barrel lock which is not accurate rather than anything to do with the mechanism it’s like the key itself is making the noise as if it’s not accurate the friction noise is felt by the key ,it’s not difficult to turn a slight resistance ,am I correct expecting the key to turn smoothly or is this classed as acceptable please ?what would cause a key seeming gritty when turning it please and do I have grounds to as for the barrel to be changed thanks in advance Kind regards Pete