Seatpost mounted rear rack = HEAVY!
 

My quick release rear rack weighs about 3 lbs. It figures with that long 2" thick tubing the manufacturer has to use to give it stength. I have to use one because my Univega doesn't have those seat stay buttons where i an use a standard rack.

Is there a rear rack made that doesn't require those buttons and isn't seatpost mounted? Can I have some buttons welded/ brazed on? Thanks for any help. :)

http://www.oldmanmountain.com/rear_rack_page.htm

Check out the Cold Springs or the Sherpa. I've never personally tried them, but they seem to fit your needs. A bit pricey, though (for me at least).

Just lose three pounds and get over it.

What type of rack do you have? the heaviest I see is 1.2 lbs.
http://topeak.com/products/Topeak-RX...sideframe.html

Delta makes a couple of racks that are relatively inexpensive and easy to mount. One is called theDiscrack and it works well for bikes that have disc brakes and the other is Megarack Sport both will carry up to 30 lbs which is more then the seatpost mounted rack will carry. I have the Discrack on my Stumpjumper that doesn't have eyelets (on the drop outs and the seatstays) and it works well.

I'm not a fan of seatpost mounted racks as I consider them goofy looking and a bad design. On the other hand, the Old Man Mountain has it's own problems. The $125 price tag is only one of them. I didn't like the inability to use the quickrelease on the rear wheel for one. The other problem I had with it was the skewer bent. The skewer has to be extra long and I'm afraid that it just asking too much of a thin piece of steel to do the job that it needs to do.

One question however, does your Univega have the braze-ons at the drop outs and not on the seat stays? If it has the braze-ons at the drop outs, you can always use p-clamps to mount the rack to the seat stays on a conventional rack.

P-clips are the answer to your problem. You should be able to use correctly sized P-clips to attach a standard rack even where there are no mounts. The resulting rack will be stronger that a seatpost mounted rack but I wouldn't trust it with the racks max rated capacity.
My Ascent Horizon/Blackburn Expedition came with a pair, so some racks may even have some in the packaging.
Craig