Most Push Coupler descriptions I have seen, i.e., Kottick, Hubbard et al., have the lower manual utilizing a dog to push at the bottom of the keys of the upper register.  The upper keys will then move with the lower keys when coupled and thereby move the front 8'.  My instrument, a 1977 Ross Flemish Double after the 1642 Moerman, is somewhat different. 

 The front 8' jack is stepped with the shorter portion activated by the upper manual and the longer portion which faces toward the back 8' activated by an additional raised and flat extension on the lower key (the extension rises from the key lever and is in front of the normal felt for the back 8') that makes contact when the lower manual is pushed forward.  The upper keys therefore do not move when coupled although the front 8' now sounds.

My question basically is this an unusual design?  Particular to the Moerman?  Particular to Ross?  Thank you in advance.

Sandy Hackney
Easton, NY

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