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Oil pump retaining pin article: technical section

Hi all,

There is a new article in the technical section about variations in the BSA oil pump retaining pin. Ian Wright posted about this some years ago and I remembered his post when I was going through my stock of M20 parts. I have edited Ian's text (with his approval) added the photos for clarification and Nick posted it on the technical section. John's name is behind the title of the article at this moment, that is an error and will be changed shortly.

@Ian: thanks again for this excellent research!


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