[abl1111]

I should have been little clearer.

The underneath support is (2) 3/4" pcs of ply glassed together - 1 1/2" thick! and takes up almost the entire area of the anchor locker. It is not just the footprint of the windlass. It includes the anchor roller too. And extends way beyond the footprint of both of these deck mounted things. It's overkill, but that's the way I re-did everything on this boat.

I am pretty sure the underneath is not my problem.

There may be a slight soft spot from the old anchor line storage-thru-deck-hole that I closed when I put this rig on... But it was VERY minimum. The deck is solid ! The core could be slightly compromised in this exact area - this could be the issue though.

So, I want to increase the footprint on the top of the deck...