No headstands to lock that base in place
To eliminate bending over to lock the casters on my jointer's mobile base, I extended the factory lock knobs as shown above. Here's what worked for me.
In a steel bar the same width as the mobile base, I drilled holes slightly larger than but spaced the same as the knob holes on the mobile base. Then, I attached the bar to the jointer cabinet directly over the knob holes, using self-tapping screws.
I cut two lengths of 3⁄8 " threaded rod that extend from the wheel to about an inch beyond the steel bar. After turning one end of the rod into the base's lock-knob hole, I put a jam nut and coupler onto the free end of the rod and a jam nut on the shaft of the factory locking knob. Finally, I threaded the factory knob into the coupler, where shown, and tightened the jam nuts against the coupler.
—Jan Svec, WOOD® magazine staff