Posted by The Lurker on January 12, 2000 at 16:50:09:
In Reply to: problems with hirsbrunner rotors posted by Bill on January 12, 2000 at 16:08:06:
SOME of the OLDER HB-2's had plastic (teflon) valves. These would expand in hot weather and get hung up in the valve casing. Keeping the temp down fixes this. Later, they put brass valves back in the horns. These have NO problems whatsoever.