Posted by John Swensen on August 17, 1999 at 14:11:53:
In Reply to: mouthpiece-backbore out of round posted by Chen on August 15, 1999 at 11:46:52:
Depending on how much your shank deviates from round, the discontinuity where it meets the receiver could cause some fuzziness to the sound. This problem is very easy to fix, however. Take you mouthpiece to a hardware store and find a center punch with a taper that closely matches your backbore. You want the punch taper to contact the shank just at the opening, not deeper in the backbore, but you don't want such a steep taper that it will flare the end of your backbore. If you have a choice, pick the punch with the smoothest surface (no roughness should be detectable with your finger or fingernail). Push and twist the punch into the backbore (hand pressure only) and the dent should be removed in about 10 seconds or less. Sometimes a drop of oil, grease, or soap on the punch will make the job easier. Be sure to wipe off, then lightly oil the punch so it doesn't rust.