Oil pump adjustment

[woodentopp]

I know this has been asked before and is perhaps a silly question, but....When you measure the gap for minimum stoke adjustment, Where do you measure?

I know it's under the washer, but against what?
Any pic's/photo's gratefully accepted. ;D

[arrow]

Here. Its a little raised area, and the only correct place to check the measurement. This pulley is off an aircooled 250 but the photo is still relavant;

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[woodentopp]

Thanks