The Ditchburn lock is a custom made lock, completely hand crafted in my shop from lost wax castings . The castings are machined by me and hand finished and  parts are hand fitted & tuned.  ALL MAIN SPRINGS ARE HAND FORGED BY ME.  All heat treating is done in my shop.  All screws are made in my shop to my specs. and all screws are hardened and tempered. The lock is then hand finished with 220 paper & finely glass beaded for easy browning or further hand pollishing. My lock comes to you completely tuned and ready for installation WITHOUT further work.