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Jerome.
Thanks for the neat game you set up. You sure got a lot of action in a short time.
My scientific calculation was less than 10 percent over.
I used the method that is used to guesstimate the number of animals in a herd, or trees in a forest, from the air. I guess it works pretty well.
Mac.
Its funny my first guess was 250. Then I started counting and came up with 16x. I assumed there were several I couldn't see. Since the couplers came in bulk packages of 50 and 25 my guess was 175 or 200. I could not imagine not being able to see 30 couplers. I did not make a guess that some set were alread installed and gone from the batch. This was fun.