This is also a good argument for a galvanized shackles. Stainless chain hooks may slide on and off a little easier, but over times I suppose there is some effect, if you are on the hook a lot. I just go all-galvanized.
Personally, I can't see much use for a swivel. The original SS swivel on Shoal Survivor (15 years) revealed an incipient crack when I took it apart to install a new anchor. No thanks.
(not my swivel, but it shows what side leverage can do)
- Align the chain between the anchor and the gypsy. The chain can't spin in the gypsy, can it?
- Motor/draft backwards if need be; most anchor will alight due to water flow.