Paul from SWISCO responded:
March 13, 2017
I believe you need our 21-077 old style National guide pin, as well as the 21-077 (which uses the 21-026B pin with 21-113 cap), the 21-252 spring, and finally the 21-155 palnut. These take a bit of work to install, though. You will need to use a mallet to hammer on the cap. Look these parts over and see what you think.
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