How to do a lock stitch?

Hey guys, in my never ending quest to keep a seam nice and tight, how do you tie in a lock stitch? I have never done this, but I read somewhere that for long seams when sewing a game head, that you should lock the stitch every 6". Anyone got a diagram?

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there is one here

http://www.TaxidermyReference.com/Stitches.html

thanks!

Thanks.

Hard to see

I saw the diagram and it is small and hard to see and understand. Anywhere else I can see this stich? Thanks!