Parker Fly Handbook page 17

Using Sperzel Locking Tuners
Virtually the only part of your Fly guitar that isn't made by, or especially for
us, is the tuners. We proudly use Sperzel tuners, designed and
manufactured in the USA, because they combine excellent quality, a
patented string locking system, and minimal weight. Sperzel's patented
string clamp eliminates tying and multiple string wraps, greatly
improving tuning stability.
To remove a string, detune the guitar
and loosen the knurled knob at the
back of the tuner. Stop loosening when
you feel some resistance. Before
restringing, turn each tuner until the
hole in the capstan is parallel with the
string path. Feed the string through,
pull out the slack, tighten the clamp
knob, and tune up. Do not over tighten.