Pier head for CG5??

I'm considering installing a piece of heavy 4" galvanized pipe in my front yard as a pier. I'll probably build a small deck around it but this pipe is heavy and set into a concrete base will be mighty secure. What I need is an adapter to fix the CG5 to the top of the pipe. I can fix a plate to the top of the pipe but would like to buy something off the shelf rather than spend lots of money at a machine shop.
Anyone know of a source?

I believe this will do what you want. Another Astromart Supporter too http://www.kendauzat.net/other.htm

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You may already have proper plans for this, but you did not mention it--You can't just plant a pipe in the ground. You have to have something that allows you to adjust the tilt of the pipe--or the head. Either you have the top of the pier, or the whole pier adjust so that it can be leveled.

Alex