You don't it's a bit trial & error - providing you have broken the hard
shell enough to let the water in you have done the job.

S
"Ant" wrote in message
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"Noodle Doo" (spam) wrote in message
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If they are large seeds it can be done wit a sharp gardening knife. I
would think that small ones could be rubbed between 2 sheets of medium
grade sandpaper.

Thanks, and how will I know when they are nicked enough?