The Parker PDF models use an upgraded locking tuning machine to help stay in tune. The tuning key can be turned as normal, though you have the added bonus of an extra
tightening point on the back side of the tuning machine. When re-stringing, it is important to remember to tighten this dial down so the string does not slip from the post.
A. To lock your string into place once threaded through the string
post, turn this dial clockwise. To loosen this portion to remove a
string, turn this dial counter-clockwise.
B. Tuning key- you will make all tuning adjustments here
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