什么时候需要锁匠？
sometimes anyone that is handy can replace an old lock with a new lock. some services require the knowledge only a professional locksmith has.
if you are simply needing or wanting to have a different key open your locks then having a locksmith rekey your house is going to be less expensive than replacing all the hardware. however, if you have different types (schlage or kwikset) on various doors it would be beneficial (but not necessary) to change out your hardware. click for more information.