Carl R. Stevenson wrote:
Rohn 15 is tapered at the top of the sections to fit inside of the bottom
... I don't recall the exact dimensions, but the top, tapered part should be
"concentric" with the bottom of the next section and fit inside.
(you may already know all of this and may be describing something different)

The two pieces I have are not concentric and each
tapered part slants toward the middle at about 3
degrees rather than pointing straight out. The
slant is enough to cause the pieces not to fit
together.
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73, Cecil http://www.w5dxp.com