front derailleur clamp....who knew?

So I pick up a used front and rear derailleur set (shimano 600), and I think everything is cool.....that is until I decide to actually look at them. Lo and behold, a front derailleur without a way to attach it to the frame! Silly me, I thought these things came with one -  the guy who sold these to me must have ripped me off! I go to the web to look for a front derailleur like mine and of course it doesn't have one..................you have to buy a clamp that matches the diameter of your seat tube............duh! So, a minor setback and a week or more for the finished product.............I learn something everyday!