A KIK cylinder that I bought that was defective. The key way was broached wrong no SC key would fit unless you took off material on the bottom. I took an SC4 key and made it fit, then I cut it to the bitting 151457. My zip code and a 7. Because the key sits low, I needed to use larger key pins and even needed to file a couple down. The key will work in any SC4 lock with the same bitting. Loaded it up with some hand turned driver pins.
Ilco lock, Schlage C key way, Pinned 7. Key hand cut 7 from a SC4 blank. Bow cut back with a Dremmel, side milling extended. Then used space and depth keys + a Lishi tool to cut the bittings. Bible was drilled and tapped for set screws. Custom key pins and drivers were turned on the Dremmel with needle files. I never thought to make it a Travel Bug till explaining caching to a customer. Tracking number stamped on the lock and a tag on the key.