That looks pretty slick, but before you go out and drop the coin on it, have you tried removing the spring / plunger assy in the Shifter Assy? There's an article about in in the (let's see if I recall....) oh yeah the "Shade Tree Mechanic" by Chuck Engles (PCNC).
It was not too long back, April 1993, I think.
Regards -
Rocky
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