Revisions log for Answer #3181

It is the coupling of the previous cylinder (which is usually inside the cam) that must be broken to open the lock, leaving the rest of the cylinder inside the lock.

However, if the current lock, after replacing the cylinder, does not close properly, it may be because when the lock was opened when the cylinder was split, they deformed the lock case (in which case the previous cylinder will also give some failure), or because the new cylinder does not have the cam that the cylinder itself needs.

Generally, in profile cylinders, we have a long cam and/or a short cam, but in some cylinders with a long cam, the cam shape (dimensions), does not allow some locks to work properly.

Also, sometimes, due to age and wear on the inside of the lock, when we install a new cam, they don't work properly until the cam begins to wear due to use.

If you provide pictures of the lock, cylinder and current key, we can more accurately surmise the possible problem as well as ways to fix it.