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We just bored out one of the damaged sleeves from my Donovan block. The numbers on the back are either S35A or S350A. They are not clear. Anyone know whose these are? Darton says not theirs. Thanks
 

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corcon,
Those numbers and lettering has Jeff @ Advanced written all over it .
S more than likely means if it has 1 or 2 flats on the flange.
Number is a way to keep track of what it fits.
A , B or C means it's a Standard OD , B is .020 and C is .040

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