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Hi Steve,
I'm half way thru an 18in dob build as you know( using Kriege's book) and have on hand a set of moonlite twin ball/socket ends (for top and bottom) and have gone with 1 1/4in tubes. The fit is just a tad loose but a little bit of 5 minuite areldite will fix that problem. The instructions suggest putting a screw thru the tube into the derelin as well. Although I dont have these its a good suggestion to have split blocks on the bottom end so the poles are held upright, making your job of attaching the upper cage easy, otherwise its a two man job.
I got the threaded inserts from obsession and they are worth it.
Just to throw you a "wabbly" I did not consider the 1in tubes, I know Kriege's dobs are overbuilt but you are talking about a smaller diameter and thinner tube with the 1in comparred to the 1 1/4in tubes, too risky in my humble opinion.
When you build the upper cage and see the size of the bloody thing you will appreciate the larger tubes!!! Krieges book explains the mathametics of a smaller diameter which scarred me into the bigger tubes.
Adios
Mike
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