Do you use the reccomended silicone spray on the elevating gear and also remove the flat top plug and spray it there?
This is from the manual:
LUBRICATION (Done 3-4 times annually)
STEP 1: To lubricate the elevating gear, apply a
liberal amount of silicone spray lubricant to the
elevating gear with the lift in the down position (see
illustration). Run the lift up and down to distribute the
lubricant over gears.
STEP 2: Two times yearly, or in the event rotating the
antenna becomes difficult, normal operation can be
restored by lubricating the bearing surface between
the rotating gear housing and the base plate. Any
silicone lubricant spray may be used. Elevate
antenna and remove plastic plug from rotating gear
housing as shown. Spray lubricant into hole and
around edges of gear housing. Rotate gear housing
until lubricant coats bearing surfaces and antenna
rotates freely.