I ended up going with aluminum.
The plate was fabricated from 1/4" Aluminum.
The bushing is threaded at 1/2" - 13.

The weight turned in at 5.1 oz. each.

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From: "Al Gietzen" <ALVentures@cox.net>
Sent: Saturday, July 24, 2010 8:23 PM
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: SPAM-LOW: [FlyRotary] Re: Tie Down Hardpoints

I know, an old thread, but; yes, the oxide layer that forms inhibits further
corrosion of the SS; but imbedding in epoxy (fiberglass) protects it even
better.

Al