Mike (the horn doctor) is without a doubt one of the best repair people around. If he didn't live more than a thousand miles from where I live, I would have him do ALL of my personal horn cleaning and repair work. I would even bring my personal horns to his traveling repair trailer...because Mike is THAT good.
I'm sorry to hear Mr.TsoChicken had a weird experience with him. Honestly, it sounds like you dealt with another horn repair guy. I've personally watched Mike work out of his traveling trailer for several years now (on probably over 3 or 4 dozen instruments at this point), and what he's able to do in that small space is incredible. I've NEVER seen him send a horn back out with solder balls and holes...never. I have, however, seen that kind of slop on repairs from another drum corps repair guy who shall remain nameless...but not from Mike.
Keep up the amazing work, Mike!