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From our web site bubbasignition.com
One of the secrets from the orginal Ford folks was the placement of a felt wick
( the worm)) placed inside the Crab main shaft. This wick was lubed and allowed a slight amount of oil to transfer to the crabs outter bushing.
Some use a staked screw while others use a welsh plug......somewhat debatable as to whether this worm needs service ????
It must have worked very well as you seldom see a bad bushing in these units.