How do you apply Sentry Ahab's Helm to your robot? I feel like an idiot right now but I need answers. Is it a special mod? Thanks in advance.

Each head has different armors.

Ahabs head armor is exclusive for Sentry Bot heads.

You first need to build a Sentry head for your robot, and then apply the mod armor.

That means, if you are using assaultron heads, protectron heads, robobrain heads, etc. It's not going to show.

I never seen a sentry head to pick up :-\