Always use a locksmith you can trust! I changed the key to a customer's locks in the Hornsby area today, to find that the previous locksmith had left out pins in the lock cylinder! This reduces the security of the lock and makes it more suceptible to lock picking. As part of the rekey service, I replaced the missing parts and tested the lock function of all of the customer's locks. A locksmith is a professionally trained and LICENCED provider of security services under the Security Licencing Enforcement Division (SLED) of the NSW Police. Check their credentials before handing over access to your life.