Charles Hampton KA8JVX wrote:
Did you use the old red rubber tubes? They stretched more than the
modern rubber tubes.

Yep, that's what I used during WWII and after. When I was a
teenager, I learned about surgical tubing and 3/4" plywood.
I finally sprung for a $2 Whammo sling shot but someone stole it.
--
73, Cecil, W5DXP