neck extension

My 1936 10M with its original neck is approximately 11-1/4 inches in length. I can get the horn to play in tune, but barely, by pulling off the mouthpiece leaving only about 1/2 inch of cork under the piece. Reducing the wobble is accomplished with a sheet of ordinary Sticky-Notes paper from the...

Dimensions of my neck cork and my metal Link O.D. Cork - 11/16 I.D. Link - 11/16 O.D. Link - 25/32 (3/4 + 1/32) Found on Amazon.com $ 1.15 Nylon 101 Hollow Bushing Stock 3/4" Nominal OD X 11/16" Nominal ID 12" Length $ 8.03 Polycarbonate Tubing, 3/4" ID x 1" OD x 1/8" Wall...