A SECRET WEAPON FOR D4

*Why "D4"?  I usually get questioned,  and receives jumbled with A5 (which happens to be a climbing grade), and D5 (which stood for "Deuce5"), two models I have already been associated with in the past.  My nickname in Yosemite was "Deucey", coined by Grant Hiskes  who mangled my Friesland ancestral title "Middendorf" to "Dusseldorf",  and Deu