You can make your own plates with coordinates with trig. X using sine y using cosine times the radius. For simple math example a four hole plate. 360 divided by 4 is 90. First hole is just your radius. Next is radius times sine of 90 for the x coordinate and y is radius times cosine of 90. Your next hole is 180'degrees and so on. You ll have four quadrants of x and y which simply is top bottom and left and right. Make any plate you need. Use degrees minutes and seconds and not just a decimal for non divisible numbers.
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