I loomed my oars with builders twine and some thicker rope at the top. Basically you put the twine on like you would whip the end of a rope working it as tight as you can. For the button, I think that's what it's called, I used some pretty thick rope I got from REI. I put a screw, I think a brass screw with a pan head, through both ends to hold it in place. Once I got it where I liked it I put some 5 minute epoxy around the button. After that I used spar varnish on the whole thing. They've held up pretty good but I don't use them much.
The oar plans I got from here:
http://members.fortunecity.com/duckwork ... /index.htmRope wrapping instructions:
http://www.duckworksmagazine.com/06/how ... /index.htmHere's where I cribbed the information about cheap thole pins:
http://www.duckworksmagazine.com/05/col ... /index.cfm I didn't bother adding the little wooden bock under the oar.