First reference is a pretty detailed "swinging-gate" mount. Don't
recall the details on the second reference.
Nov 1976 QST 17 Side-Mount Rotator for a Large HF Array, A
Keywords: CONSTRUCTION TOWER ARRAY ANTENNA Ashcraft, J.P., WB5BFZ/WB5DTX
Feb 1991 QST 30 Rugged Side-Mounting for Rotatable Antennas
Keywords: ANTENNA INSTALLATION TOWER Keown, Malcolm, W5XX
This should give you a good start for finding some info.
73--John W0UN
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