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If you make one, make sure you don't put the holes too close to the outside (see pic)
Also do use a compass to make sure your holes are evenly spaced around the circumference. Make your holes big enough to just mask off the primary mirror by about 3-5mm. This will 'hide' any turned down edge you may have on the mirror. At the same time as hiding your vanes obviously. If you have a 4 vaner, use a four hole mask.
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