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The teflon pads should subtend the smallest angle to the rotational axis consistent with stability. The bearing performance of the pads is best if the downward force acts at rightangles to the pad.
If you make them at too wide an angle the downward force tends to be a sheer and this will increase the stickiness of the pads which will tend to make the movement a little jerky.
I would use a nominal 60 degrees as being about the best compromise.
Barry
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