Yokes were made by Dowty of course, and with various minor differences the Oleomatic forks were also used by Velocette, Panther, AJW, and others. When Matt Holder converted them to conventional coil springs on the later Brum bikes he still used the basic Dowty yokes, etc.. My 1972 Brum even had the notch cutout on the edge of the top yolk, where the Kilner valve was on the Oleo type forks.
Brian
