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Model M Spark Issues

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After years of reliable service the M is giving me the dickens with inconsistent sparking problems. i can pull cap and rotor and see some sparking then nothing. meter showing power to coil, distributor, points.
points have been cleaned and gapped, coil new. i have also bypassed switch with jumper direct to coil. still several weak sparks then 0.
could it be the grounding of distributor itself? plate to casing?
looking for advise to where to look next.
thanks to all members in advance

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