Quote:

Took it to a lock smith to make a key. Then to another one, more into car locks.

They looked at it and say they don't understand the function of the lock of the cap.

See attached pic, perhaps something is missing.



I have had the exact same experience. I have an NOS piece that will not lock. So I took it to the oldest (expert) locksmith in town. He was familiar with the Briggs and Stratton stuff. We dissassembled it together and could not understand how that design could ever lock. It's quite a simple collection of parts. He also said he thought it had to be missing a part.

As someone else suggested, I now use it just as a regular gas cap.

Until total honesty is on the table, we're not even talking about reality...