Manufacturers of tool chests have their respective replacement locks as well as other hardware. Also included in such replacement parts is the detailed instruction on how to properly replace such hardware locks or locking mechanisms. Generally, you will need to remove the existing lock by removing the top drawers, exterior nut, and lockbar. Tool chest come in all shapes and sizes.[/caption] This should give you plenty of room to access the lock. You can then install the replacement lock and put everything back. Alternatively, you can take your tool chest to a locksmith or ask one to come over to have a look at your lock. He or she can also replace it for you for a fee.