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Pull-release changer

The "Pull Release*" changer only uses one single finger* per string, (unlike the Push Pull or All Pull changer which has articulated fingers (split finger).
my wonderfull Jackson Madison 63
Depending on the number of anchor points of the pull rod* at the bellcrank* and finger*, several raises* and/or a lower* per string can be obtained simultaneously. Due to its simplicity, this very reliable and robust system equips many "student" models which offer a copedent* of MI 9° up to 4 pedals and 5 levers.
The principle is based on the use of a return spring at the levers that lower the notes. The spring exerts a pull in opposition to the tension of the string and keeps the lever at the stop (lever stop*). The only limit: a string cannot be tightened or relaxed simultaneously (the raise is predominant). For strings subject to a lower, the "open" note is obtained by tuning to the keyhead* mechanism while the lever is held on its stop. The lower* note is obtained by operating the lever to a counter-stop to cancel the pull of the return spring then by tuning the note at the changer by the nylon hexagonal nut The raise* note is obtained by operating a pedal or a lever then by tuning the note by the nylon nut as for other changer systems (all-pull* or push-pull*).

1) Getting a raise with a pedal

It is the action of the pedals A B C which raise strings 3, 4, 5 and 6 and of the lever F which raises strings 4 and 8 from E to F.

2) Getting a raise with a lever

For the F lever which raises strings 4 and 8 from E to F and the G lever which raises strings 1 and 7.

3) Getting a lower with a lever

Case of lever D which lowers the 2nd string from D sharp to D.Case of lever D which lowers the 2nd string from D sharp to D.

4) Getting a lower and a raise on the same string

Case of strings 4 and 8 which are raised by the F lever from E to F and lowered by the E lever from E to E flat, and of the 5th string which lowers the B to B flat.