Aluminum Angle Tool, Model Rocket News - Volume 5, #1

From the Estes Model Rocket News, Volume 5, #1
The first reference I've seen for using an aluminum angle to mark body tubes for fin placement.
This MRN dates back to 1965. I thought it was a more recent idea for a tool.

In the same issue there's also a good plan for an Aerobee Hi.

To see the issue, go to www.oldrocketplans.com or, CLICK HERE