CLK Supplies: Locksmithing 101 | Re-keying locks? Don't make this mistake!
I want to go over a common locksmithing mistake when rekeying apartment complexes, office buildings, or anyplace that has numerous doors and people using it…. REMOVING EXISTING MASTER PINS!
Always check for existing master pins. It is very important when rekeying or master keying existing locks that you check for existing master pins to avoid cross keying and other security issues.