I have one piece 3/16" SS backing plates behind my cleats. It would have to ripe out part of the deck
to brake them loose. 1 mm (.040") thick is not much better then fender
washers. It wouldn't pull out EZ but would loosen up under heavy stress. Once loose it would continue to wear away at the holes.
As for anchoring
, there are special anchor
cleats (clamps) for that. You'll want your anchor to come off a bridle
or straight out your roller unless you need to heave-to, so to say, in a strong wind
at anchor for ease of motion reasons.
Cleats should be strong but not your main source for extreme weather
e.g. Sea anchors need a very strong attachment(s) that will withstand hours and hours of constant abuse. For this many build in special eyelets for attachments. But if you plan anchoring
in heavy weather anchorages
I hope you yourself can hold up to the stress. As well, you'll most likely want to put in a spring line or add a kellet to reduce stress on the attachments.
As for what you have, I would
beef it up with thicker single
Here's an article that'll give you more info on anchoring....................._/)