Quote:
Originally Posted by Welshy40
............ Ive tried countersinking them myself and am unable to do it.
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It is tricky.
You need a back-countersink tool. And first you have to get the part clamped on your drill table and aligned with the hole. The back countersink, which would be a special, has to be fed through from the underside and engaged in the drill chuck. Then you start the drill and then you feed the cutter upwards to make the countersink.
To cut plastic, you can make your own back-countersink cutter from a countersunk headed screw. Just file the teeth on it. I can't be a long screw as you have to feed it between the top and bottom kingpin points on the knuckle.