Hi Everyone! So, I have always had a problem with Eb, E and especially F (top of the staff) on C trumpets. If I don't hit them square, they split. In january I purchased a Bach Chicago. It seemed like the more I practiced the worse it got. It got to the point where I just didn't play C trumpet at all in the last few months. I finally started playing the horn again. It seemed to be better when I first picked it up. After about a week of playing the horn the problem came back and got worse every day. Last friday I picked the horn up not realizing the main tuning slide was pushed all the way in. I went through my warm-up. The problem was gone. Completely! I could not get it to happen. Then I realized my slide was in. I pulled it out about a half inch(it's a really sharp horn), THE PROBLEM WAS BACK! This got me thinking. In college, Hickman said sometimes when this problem happens, putting spacers in the leadpipe to fill in the gap will help. So, I ran to the local music store, got some pipe and started cutting spacers. I put one in the top and the problem was better but not totally fixed. I cut one for the bottom and it went away completely. This is going to be a pain in the butt when I play in something that is a little high. I have cut several lengths of pipe and I have taken a long, skinny, flat screw driver and bent the end to get these pieces of pipe out. I am amazed! I thought this was just voo-doo. When I take them out the problem is there and when they are in, I can't for the life of me get it to happen again. I thought I would share my experience in case someone else is struggling with the same issue. Note: If you try this, make sure the pipe you get is the correct size and go to home depot and buy the correct size pipe cutter. Don't try to use a hacksaw. You will never get a clean cut.