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​From the CMMS archives, here's a plank/deck scriber from member Ed Petrucci using nothing more than a hacksaw blade
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Here's an easy to make homemade lathe by Ed Petrucci. 
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  Another sketch shop note from Ed Petrucci
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Two sketches for fabricating modern yacht fittings from  Ed Petrucci 
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Handy scale knots for ship model builders from Ed Petrucci