Set Plunge router on the outer hole drilled in pic 1. Lock arm & swing router on pivot to the other end of the corner . Plunge the router about 10 mm from the edge. Again place the drill blank through the ruler clamp the ruler and drill the inner 3 holes with 1/8 drill through the ruler. For each slot lock the arm with bit in hole at he starof the curve. Swing the router to the hole at the end of the curve. see if router drops into that hole. If it does the slot can be cut from the start of the curve - make sure the pivot arm adjusters are locked first. This method was also used on the straights.

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