Step 3: Layout the Boom once cut from the Donor Bike
The boom is positioned on head tube to see where to drill miter hole. The drill with attached hole saw** bit is positioned to convey the idea of mitering.
* Headtube is the pink frame's front frame tube through which the bike's fork steering tube passes.
** Hole saw bit is the 1.5 inch diameter white toothed cylindrical saw in the drill chuck.