We don’t recommend drilling holes in the shank for several reasons (a) because it weakens the shank both due to the hole and possible overheating during drilling of the high tensile shank and (b) corrosion due to damage of the hot dip galvanizing.
We also don’t recommend using a pin to retain the anchor, as wave action can bend the pin making it impossible to deploy the anchor quickly in an emergency (this has happened to some customers). Rather, we recommend lashing on the bow, which can be untied to deploy or cut free in an emergency.
