What you need
1. 3-4 inch peace of pipe. PVC or Brass, reducers are best. so you can hang dry and no rust.
2. Get a fine feather pant brush. All you need to do is feel for the softness or toughness you want.
4. Water proof glue. I used Shoe Goo but epoxy would be best.
5. Washer rings. So you can seal off the end and adjust the height of the bristles.