In 1998 I sold my 1969 Holton Al Hirt Special for a a 1985 King Silver Flair with 1st valve trigger. I bought the Al Hirt special at a house hold sale for $25 and got $50 for it at the a music instrument dealer. Eventhough it had some small dings and wear I kick myself for selling it. I also owned a 1979 Benge 3x and do own a 1955 Holton Super Collegiate. What I discovered is I overall play much better on trumpet with smaller bore (around .459). My King Silver Flair has a .463 bore. Does the lead pipe more or less determine the bore of a trumpet? By replacing my Lead pipe with .459 bore one, would I get the upper register range I had on my Holton trumpets? Also, by breaking the weld and reattaching another lead pipe produce a tarnished silver finish where it is done or is there other means of attaching it like gluing? Thanks for the advice.