Nylon Hex Head Screw to Replace Metal Tacquet Valve Guides

A single nylon hex head screw  to replace the old metal tacquet guides in older Besson / B & H   tubas, euphoniums and baritones. Simply remove the old guide Use a tap to alter the thread from 7BA to M2.5  where the gude screws in (guide and tap set also for sale) Use a heated blade to cut the head of the screw into a rectangle and file to fit. With a bit of care an patience this is the most cost effective way to replace the metal and often noisy guides with plastic ones The hex head screws are also available to in a set of 4 with an M2.5 tap as a kit.