Calling Z-S experts

["Chris Kent Kantarjiev" <cak@parc.xerox.com>]

That should have been "calling GT6 experts". Several years (I think
69-72) of the GT6 got a version of the CD150 that is completely
NON-adjustable. The seat won't move, the needles don't adjust by
sticking an Allen wrench down the dashpot.

If you're running rich, check that the needle is seated properly (that
the collar is flush with the bottom of the piston). If it is, then you
probably need new needles because yours are worn.