SHAFT SHARK - Installation Instructions:

The Shaft Shark should be installed with the labeled “AFT” side facing aft. It will be mounted flush up against the propeller hub on the fixed diameter of the shaft.

The split models (#300, #400 , #500 & #600), do not require the removal of the propeller prior to installation. It is kept securely in place by the clamp action of the two allen-head bolts.
Separate the two halves. Re-position them around the shaft, up against the forward edge of the propeller hub, and tighten in place with the two bolts.

The single piece model (#600 & above) will require removal of the propeller for installation.
Remove the propeller. Slide the Shaft Shark onto the shaft. Re-install the propeller. Position the Shaft Shark up against the forward edge of the propeller hub and tighten the set screws.
It is then held in place by set screws into the shaft.

Note: In each installation it is advisable to use loctite or similar on the bolts/set screws.