He's not growing S1's he's growing F1s. Stop giving clueless advice.
Promedz gave you one idea and here's how I do it. Then again I'm processing 1000's of seeds frequently. Hang your bud until it's very dry.
Clip off buds into largest wire mesh strainer, process and remove large stems
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Seeds and semi-processed bud will fall through to next size mesh
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Pick out trash and strain the rest of the vegetable matter down to the final size
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At this point all the seeds are in the middle strainer and all your processed bud material is in the final pan. I collect, bag it and I smoke it. I'm getting ready to smoke some Bodhi Snow Temple that you see. It's a sativa leaner with decent relaxation and euphoria.
Hth,
Annie