Where Would You Attach the Tripping Line?

I have only used a tripping line during testing as an aid to locating anchors for placement and diving inspection. However, I observed the following while investigating tandem anchors for rocky locations.

There is the traditional location. Nearly every anchor has a hole high on the crown, though honestly, I think it is only useful for lashing. It certainly is not going to release this chain anytime soon.

 On the other hand, if we move the tripping eye to either the bottom of the shank or the back of the foot, we can actual l pull in the right direction.

granted, the Claw is the worst case. But still this seems, well, obvious. And I'm not the only one to notice. Rocna added a tripping eye to the back of the fluke years ago.

Likewise, I've been using a hole on the back of the fluke of my Manson Supreme for both tandem rode and tripping.

 I'm setting recovering a tandem anchor rig. The carabiner in my hand holds the trip line to the secondary anchor, which I will now use to recover it and bring it on-deck. This is a rocky location, so it's very likely hooked under something.

 

Does drilling a hole weaken the anchor or cause corrosion?

• Weaken. Obviously this depends on the location. In the shank, maybe, although the area near the fluke is never a failure area. In my case, drilling through a thick, non-structural area of the fluke, no risk. In fact, the fluke would probably have been thinner there if it would not add cost an complexity to splice the thinner plate.
• Corrosion. Not really. The near by coating seems to be protecting it just fine. And normally I would have a galvanized shackle in there, which helps too.