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Hopefully this helps some one and if you need some more pictures close up let me know:
I believe it was a 3/4" sprinkler riser. Outside diameter of your sail post will be close to 15/16" of an inch. The riser had threads on it and was little too big to fit the sail post. So I took a 1" paddle bit, honed out the sail post and hammered the sprinkler riser in. Riser had threads on both ends. Bought a cap for the riser as well, drilled a hole for a bolt I found that screwed into the ecostone. 1/4-20 course thread. And put the bolt threw the cap of the riser, with two nuts to lock it in place. Screw the whole sprinkler cap on with bolt protruding out, and screwed speaker on. I also put pvc glue on the riser before I put it in the sail post. And lock tight on the two nuts for the bolt.
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