Take a look at this new sheaveless block by Ronstan.., extremely light. Only can handle line up to 3/16" or 5mm. Could be utile for some lightweight rigging stuff.
http://www.catsailor.com/store/pc/SHOCK-SHeaveless-blOCK-very-lightweight-392p34835.htm


Rick White
Catsailor Magazine & OnLineMarineStore.com
www.onlinemarinestore.com