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I tried the centre packing and it works a treat. The idea is too relieve pressure on the teflon sliders.Good in theory,but for some it does not work. You need viariable pressure! The easy way is too use as many thin plastic washers as possible, or at least one thin rubber washer between the plastic ones. As a turner i have machined a central bush bearing. It is made in two parts, like T shaped bushes that slip into each other. It is internaly spring loaded. I can use small washers under the spring vary the pressure. The flanges on each bush are screwed too the top and bottom boards. I have not tested this set up yet as I plan too make a complete dob mount from ply instead of the GSO one I have at present. Keep experimenting, when you get it right it makes tracking at high powers a breeze.
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