Unique problem beginning with a steep sidepull move to the "masterlock"--crank your tips in the obvious gash. A strange and obvious "thunder egg" or "geode" feature protrudes from the rock to the right of the gash and makes for an interesting hold should you find you need it. Some people exit right on this problem, utilizing holds at the top of "Black Pinch," but to truly send one must procede straight up and make a somewhat-insecure mantle. Use crashpads, or risk a pounding if you pitch and hit the pavement.
In between "Borson's Left" and "Black Pinch"
Euan at the crux of Masterlock (V3), Mt. Rubidoux....
Reaching up at the start of the crux on Masterlock...
Mid crux on Masterlock
BETA PHOTO: Borson's Wall Left Topo
Will starting the crux
BETA PHOTO: Borson's Wall Center Left Topo
"Masterlock" on the Borson's Wall
Classic pose on Masterlock