How to install passenger door lock assembly?

[Texas Tom]

This should be simple, but -- at least for me -- it's not.

I'm trying to install a new passenger front door lock assembly in a 1930 Briggs Town Sedan. Barrel of the assembly is too large to slide into hole in door skin. Assuming I can file the assembly barrel to make it a smaller diameter, how is the assembly secured in place once it's inside the hole?

Thanks.

 

[MAG]

Tom, here are pics of my 30 Briggs TS. Lock is original. Set screw comes in at a angle and Has a pointed tip that fits against a flat on the lock barrel. I did not have to file the door skin for the barrel to fit but did have to bore the new wood to install.