[MRCA] AT-1011 Tilt adapter questions/trade ?

[MilComm Guy]

I purchased a large lot of AT-1011 masts, bases adapters and various other
aluminum masts and have this tilt adapter that is smaller than what I call
the standard adapter, it also has a different thread on the bottom female
thread end.  My questions are 1 what application or base is this used with
?, 2 does anyone need this and have a standard tilt adapter they would
trade for ? and 3 does anyone know the specs for the acme(?) thread on the
AT-1011 standard base so I could perhaps have a shop make an adapter to be
able to use this tilt adapter ?
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Thanks
Mark
K1HF
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