I have a Strad - serial 20--- and I have noticed that my mouthpiece goes into the receiver much further than in a relative's newer Elkhart model. I was planning to have a new leadpipe installed, but my repairman and I noticed that the new pipes are 3/8 longer than the original. He says he can modify the new pipe so the length will be the same by moving the tuning slide sleeve. There is more than 1/4 inch available without machining or cutting any parts. Does anyone have experience with new longer leadpipes on old horns?