WWII Luftwaffe Mottling NO AIRBRUSH

Here's how I do the magic trick where I get authentic WWII Luftwaffe mottling without using an airbrush. It's complicated, but not impossible.
Here's a direct link to The Crafty Printer Etsy Store decal paper.
www.etsy.com/l...
Here's a link to GIMP -- the graphics program that's free.
www.gimp.org/
Here's link to a divider caliper:
amzn.to/3LyxPFC
I prefer the "scriber tips" and not the removable type.