Like this?
http://www.slatertools.com/rotarybroachingtools.htm

But I think this is the tool you really need, a punch.
http://roperwhitney.com/punching/2-67.cfm
or http://roperwhitney.com/punching/2-89.cfm

I've got one of these, but haven't bought the square die set yet, plan to when I'm ready to punch bed strips...
http://www.americanwhitney.com/91BenchPress.html

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
---All pictures---
"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-