A convenient way to keep your primer follower rod put away instead of rolling around on your bench. Threads onto the top of the primer feeder tube (under the top retainer nut).
To install: Remove the primer alarm and then remove the top retaining nut from the primer feeder tube. Thread the follower holder onto the tube with the cup shape up as pictured. Then reinstall the retaining nut (do not over tighten) then reinstall the primer alarm.
Color anodizing adds some durability and a little extra cost.
Made from billet aluminum.