Cam cleats are different from clam cleats. As catamaran sailor I preferred cam cleats for things where I had to reposition my hands a lot and did not have use of both hands to do the job.

this page shows cam cleats and clam cleats as well as jam cleats

http://www.westmarine.com/webapp/wcs...Search?Ns=Most Popular|0

the above search result probably will fail in a few days so here is an example of a cam cleat:

http://www.westmarine.com/webapp/wcs...classNum=10239