Is the "stub" on the end of a warded key required to operate the lock, or is it just there to make sure everything else lines up right?
Examples of blanks and keys with the end stub.
http://mysecuritypro.com/images/product ... 0small.jpg
http://mysecuritypro.com/images/product ... lsmall.jpg
Examples of warded skeleton keys with the same (but smaller) end stub.
https://cdn.shopify.com/s/files/1/0078/ ... _large.jpg