You can buy several types of guides that attach to your router so you can create decorative circular grooves on the surfaces of wood projects, or you can make up your own. Besides making grooves of various designs by switching router bits, these jigs can also be used to make circular cut-outs. Instead of cutting only partly into the surface, continue with shallow passes until the cut is all the way through the wood.
Here’s a tip on how to increase the life of old wooden gutters. The first step is to lay a new rubber liner along the inside the gutter. Adding copper flashing along the edge seals the liner, adds extra durability, and allows water to run off easily. Finally, add a second strip of rubber on top of the flashing for extra protection.