You are acquiring your brass tube at the wrong places, and your scrap wood as well. The wood should be free, the brass tube no more than 2 dollars, probably free and a rubber mallet can be found for 5 dollars at fred meyers. Besides, how many times do you change headsets, vs. how many times do rubber mallets come in handy? And the money being saved calculation was off the 120 the LBS was charging.