I would try welding on the added flanges to the anchor. Just make them at a 45 degrees to the anchor body. They only need to be a couple inches long. The problem with the chain is the roller on your bow set-up. If it is anything but a metal roller with a good bearing in it the chain will tear it up over time.
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Remember always "Fish 4 Fun"
Puget Sound Anglers -Renton Chapter-
Co-Event Coordinator Salmon For Soldiers