I had a brush head with a Acme 3/4 x 5 threads I wanted to use to clean my house siding. The only telescopic poles I had that fit it were 6-8 feet long, and I needed a 16 foot reach. The telescopic pole for my pool accessories was the right length but wouldn't fit the brush. So using XDGunFire's STL for the threads, I created an adapter to allow the brush to fit the pole. It worked great for my purpose.

The adapter has a 30mm butt end that fits the pole 1.25" opening. The hole in the adapter is 7mm and a I used a 1 3/8" screw to secure the brush head.