This picture is helpful and shows a bit of just what is right and wrong: mast step | Flickr - Photo Sharing!
The mast step has a cut out channel in it for what I will call 'Frankenstein bolts' that stick out and fit into the channel. You only need to tension your shrouds and stays to pin your mast down.
"The cure for anything is salt water~ sweat, tears, or the sea." ~Isak Denesen
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