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A short piece of 5mm rod about 11/4'' long does the trick. Round off the inner end so it drops into the dimples on the flywheel. Rest a finger on the rod while turning the engine using the rear wheel, geabox in 6th with the plugs out. Points should open when pin snaps into dimple. Set the points gap to 0.3mm or 12 thou before checking the timing. Brian.
As best I can assess, the dimples are approx 1/16'' deep and were formed by a 5mm drill tip being run into the flywheel. You will readily feel when the pin locates one and don't worry, there is no chance of the pin dropping into the crankcase. Pin could be slightly longer if you find that easier to handle. Maybe start with a 2'' piece of rod and trim length to suit.