Installed the new Advance Adapters 'Adapter' Saturday. Took the better part of the day. But it's in and no more leaks. I examined the old adapter and the crack is not visible from the outside, and you can barely make it out looking at it from the inside. It is very annoying, after spending time and money seeing a big obvious crack would make me feel a bit better about the whole fiasco.
Here's the adapter. Nice piece. The boss is bored for the 9/16 pivot bolt, so I will switch over to a the bigger threaded bolt. Right now I'm using a straight 9/16 bolt with stacked bronze sleeves.
Here's some pics of the new adapter.
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New Advance Adapters 205/465 Adapter
New Advance Adapters 205/465 Adapter
New Advance Adapters 205/465 Adapter