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First thing is to try and get it working better as it is, before you start changing things. Hard to do without seeing it. You need to have a good look at the bearings. The altitude can be easily examined. The azimuth - you have to pull the ground board off the base.
Can you take some photos and describe the current bearings for us. There have been many changes in design over some years.
It might be as simple as a good clean and the application of some good silicone car polish to the surfaces that the high density PTFE bearings are contacting.
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