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Siren 17
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Looks to be missing a block but should bolt to the floor off the cockpit. Its for your main sheet.
 

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That is your mainsheet block, but on the Cal21 (I have been on) its not located on the cockpit floor, its actually on the cockpit gunnel close to the transom.
 
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As mentioned it's an attachment point for your mainsheet, which typically is arranged in a block-and-tackle (not in the picture) to get a mechanical advantage. The pair of dark gray plastic cams at the top forms a cam cleat: if you pull a line through it towards the flat side, it will open, but if you apply tension in the other direction, the cams will close down and pinch the line.

Do you have a picture of the outboard end of your boom? That's the other attachment point for the mainsheet.
 

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I can not find an exact picture, but this is the best I could do. Instead of the swivel base mounting on the floor it mounts on the starboard gunnel back by the tiller post.

The Mainsheet attaches to a becket on the swivel, runs up to a double block mounted towards the end of the boom, down to a single block mounted on the gunnel on the port side, back up to the boom, and finally back to and through the jaws on the cam cleat.

The whole thing makes like an inverted V. No traveler is used.
Note; The harken photo is not exactly how it is set up, but should give you the idea.



Back to: Trimming Systems | Mainsheet Systems
HARKEN




 

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Here's a schematic of the Cal21 mainsheet. The block and cam cleat you have would be where the becket block on the left of the schematic are, or the starboard quarter of your boat atop the transom.

rigpics.html

You'll find a lot of info here:
Cal 21 Sailboat
 

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Here's a schematic of the Cal21 mainsheet. The block and cam cleat you have would be where the becket block on the left of the schematic are, or the starboard quarter of your boat atop the transom.
Thanks Guy for the photo that should be a big help for the OP.
Isn't that pretty much what I said? LOL!
I could not remember the exact placement on the transom not the gunnel.
 
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