The aluminum brackets feature a self-locking function. Install with mounting bolts loose, thread the plunger into place, and then tighten the mounting bolts. The asymmetrical slot squeezes the threads of the plunger, locking it into place.
Available in two styles:
Style A - mounting holes parallel to the indexing plunger
Style B - mounting holes perpendicular to the indexing plunger
Alternatively, consider the steel brackets, which include a setscrew to keep the plunger in place.