Hi Mark,
I play a Thein B-Trumpet myself. The MH-One. Here I posted some pictures and a short description:
http://www.trumpetmaster.com/vb/139/...-35526-17.html (What is your main horn?)
I am still more than happy with the trumpet. For me, the best I have ever played. Most of their trumpets are modular. So you have a big choice of leadpipes, tuningslides, bells (I think I tried at least 10 different bells with different sizes and materials), valve caps, etc. Like Simon said, get in contact with Thein in their will be more than happy to give you information how you can try some variations.
Best wishes
Marco