Tube with desired out side diameter of marker. I used 1/4" copper in the example. Plastic,stainless, brass and may other materials will work also.
Wood to fill hole in tube.
Use a hacksaw or jewelers saw to cut 1/4" sections from the tube.
Remove any burs and then taper one end slightly so that it will go into the drilled holes without tearing the wood.
Prepare a section of the chosen material to fill the holes that is 1/4" x 1/4" and 6"…Continue