While it's true that it typically takes longer to change the pedal and knee lever setup of Emmons push/pull guitars than all-pull guitars, it is a myth that Emmons p/p guitars are difficult to adjust or keep in adjustment.
Emmons p/p guitars are different from all-pulls in that a small amount of slack is needed to allow the rods to both push and pull the changer fingers. The trick is creating just the right amount of slack. Once you have adjusted the rod-collars (and pedal stops) properly, it is unlikely you will have to touch the undercarriage again for many years!
I'd highly recommend Clem Schmitz's bargain-priced booklet "Methodology And Practice In Pedal Steel Guitar". Clem used to own a steel guitar store and repair shop in Minneapolis. In his booklet, Clem explains step by step (with photos) exactly how to adjust push-pull guitars with several clever little tricks that would take a very long time to figure out.
He sells the booklet on eBay. It is currently listed as "Pedal Steel Guitar Methodology P/P Guide Booklet" for $11.
He also now sells a DVD for $17 listed as "Pedal Steel Guitar Methodology DVD P/P Guide", and a combo package "Pedal Steel Guitar Methodology P/P Book & DVD Package" for $22.
If you can't find it there, you can contact Clem at:
freedomsauce@bellsouth.net
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Some other sources of basic info on p/p guitars:
A WILDERNESS GUIDE TO BASIC SETUP OF AN EMMONS PUSH PULL STEEL GUITAR by John Lacey
http://www.melmusic.com/laceyj/guide.html
Carter Guitar
http://www.steelguitarinfo.com/adjustme ... eitup.html
Dave