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I agree with Geoff.
You don't need pads to support around the centre bolt.
Throw that stupid roller bearing thing over the fence.
You need 3 teflon pads placed 20% of the radius of the ground board in from the outside of the groundboard. Even though the groundboard is triangular measure the distance from the centre to the tip of the point. then come in 20%. You need to weigh the OTA and the base excluding the groundboard. You then get the total weight of this in pounds and divide it by 15 to get the total surface area of teflon needed for the 3 pads. I can tell you that the approximate weight is 70 pounds and if you can't weigh it use this weight. This gives 70/15 = 4.67. total pad area.
over 3 pads each pad needs a surface area of 1.55"
Therefore each of the 3 teflon pads needs to be 1.25" square. This gives a surface area of 1.56".
To do the job properly you should also cover the bottom of the rocker box with a suitable pimpled surface laminate like Wilson Art Ebony Star.
You don't need any support around the centre bolt and do not tighten it so as to exert downward presure between the bottom of the rocker box and the groundboard. It should be tightened so as to remove any slack but not exert pressure. The best way to get the tension correct on the centre bolt is to replace the supplied nut with a nylon lock nut on the centre bolt, I used a stainless steel 1 and replaced the centre bolt with a stainless steel bolt, centerbored to accept the encoder shaft for the azimuth encoder for argo navis. Not sure what size the bolt is on the 12".
Clear Skies
John B
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