Simplest method is to remove the actuator cables from each pulley and then use a "split-pin" (knock pin to our American friends) to align each pulley to its' backplate.
This holds the Valves about 3/4 open - just enough to give pretty good power, but closed just enough to make it sort-of rideable! A good (temporary) fix if your PGM or servo motor is dead!
Andy.
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