Well unless you have a model of trumpet that was built with interchangable lead pipe design it is hard to find lead pipes and other part's. Sure you can find someone to send your trumpet to to get it restored but if you want to play around yourself it is like looking for a StarBucks Coffee house in the middle of the Amazon rain forest!!!! To make matter's worse even if I had the lead pipe off and the reciever off so I could take detailed measurements no one list's the diemensions of their leadpipes on their web site's etc...... I see right now I am going to have to just go buy some copper,bronce or nickle stock and just make my own darn leadpipe. If I stick with soft metals like those listed I can use mild steel stock or old mill files cut to shape as my cutting tools. I thought about useing super dense metals like depleted uranium,tungsten carbid, or even just tool steel but I would need to have a much more expensive cuting tool and for a one of project it does not make sense to spend that type of money. I am going to go talk to the guy that did my Son's Flute pad replacement and see if he can help with finding an OEM or after market leadpipe that will easily fit. I have two soon to be three trumpet's and they all have some pitting in the leadpipe's. It is nothing serious like a hole rotten through or anything like that but any pitting will disturb the air colum. I would like to get the and keep the air colum from the mouth piece through the leadpipe,tuning slide and out the bell as smooth as can be. I guess most people do not work on their instruments themselfs or most do not modify they just upgrade to a better trumpet?!? I find amazeing that I can find Army Surplus thickening agent to add to gasoline for the flame thrower's that is still sealed and Korean War vintage but I can not google "Leadpipe or Trumpet LeadPipe or Trumpet Part's" and get and solid hits on the first 20-30 pages. I get gimp stuff like valve cap's and buttons for you guessed it the pimped out "Bach Strad's". Looking online for aftermarket part's you would think that the only company that ever made trumpet's is Bach and that the only model ever made was the Strad especialy the 180ML-37. Good to know that if I ever need to pimp out a Bach Strad with heavy cap's and buttons that look like purple wide oval brim hat's with a feather sticking out the side that someone makes those!