Use M5-.80 X 25 hex cap bolt with wing nut and washer

Designed for all launch rod sizes (1/8", 3/16", and 1/4")
One that handles 1/8" and 3/16" rod like the Estes launch pad and another for the larger 1/4" rod. I purchased my rods from Lowes.

Base part designed to be screwed into wooden frame for stability.

I also use dollar store metal pizza pans as blast deflectors. The area is large enough to protect 3D printed parts and whatever frame they are fixed to.

Update to outer.stl, now OuterFix.stl. Increased width of clip to have tighter fit with base