I was going to take some pictures of various cottered and aluminum cranks on my scale, but for the life of me I don't know where the scale went. The best I can find is this Velobase entry http://www.velobase.com/ViewComponen...115&AbsPos=115 which lists the weight of the medium-to-low end Ofmega cottered steel crank with single ring as 871 grams. This seems to compare pretty well with modern low-end aluminum cranks listed at Weight Weenies. http://weightweenies.starbike.com/li...y=manufacturer

Of course, as I mentioned it's perfectly possible to save a bit of weight by replacing cottered cranks with modern ones. Assuming the OPs cranks aren't any heavier than the Ofmega junk, he could save almost a half a pound by putting on some Record Carbons. And of course, taking his forty year low Raleigh from 29 pounds to 28.5 pounds will make all the difference!