There are a number of ways that it can be done, installing it on the mouthpipe is the easiest in my opinion and probably the least costly in time and material. I am not so comfortable with that set up, I would rather put it in after the valve set, betweem the fourth valve and the master tuning slide. This approach is more costly and requires more skill because the sixth branch needs to be remade and bent differently in order to lower the position of the master tuning slide making room for the rotor valve to fit in between the fourth valve and the master tuning slide. It is more work but I think it looks better and will probably have less risk of altering the overall character of how the horn plays. It is doable but few technicians are interested in working that hard. Oh yeah, the branch would need to be shortened slightly and/or the tuning slide slightly shortened on the side where the rotor would be placed. details,details,details

No matter how you look at it, its a serious piece of work to do it right and make it look proper or dare I say "Original".

I love the smiley faces and I am going to use them because they are there.
Just my 2¢ worth of junk food for thought.
Daniel C. Oberloh repair tech to the stars (Floyd and Emma Starr formerly of Orting Wa.)
Oberloh Woodwind and Brass Works
www.oberloh.com