I love to touch on this subject because I see bad lock repairs all the time and it is important for you to know the difference between a good repair and a bad one,  and to know whom to trust. You can trust Master Locksmith Company to know the difference also. This photo is from a job where the customer had a special designer lockset on their home that had been repaired once before. The screw holding the drive assembly onto the lever had come loose or broke and someone had used a thin piece of metal with a drywall screw to hold it together. This had also failed. I determined that it was safe to fix this lock. The threads had been stripped by the drywall screw and the screw had come out but the body of material where the screw went was deep and there was a great deal of clean material left. So, I used a 10/32 tap and tapped it all the way down and used a 10/32 machine screw and locktite to secure the drive assembly to the lever. This created a better than new attachment that will not come loose. This is a good repair. Sorry I didn't take more photos of this one but it turned out really nice. We were able to facilitate a same day, permanent repair instead of having to special order an entire new handle and lockset which would have taken weeks to get and cost many hundreds of dollars. Again, it is not always a good idea or even possible to repair a broken lock, but when it is appropriate to do so, you need a locksmith who knows when and how to do this type of work. Whether you have a broken residential or commercial lock, call Master Locksmith Company to get it repaired or replaced the right way. You can trust Master Locksmith Company!