Originally Posted by
roccobike
The main spring action to return a brake lever is the spring in the brake itself. BTW, installing aero levers is a very good move. Not only does the bike look better, but the aero levers provide better mechanical advantage, much safer. Consider replacing the cables as well to provide smoother action.
+1 What he said.
I picked up some knock-off Aero levers on ebay, the guy sells them all the time. They turned out to be Nashbar product, I thought they were pretty decent for the price.
Item # 310124122777 is one of his sales. For a little under $24, you get a set delivered to your home with two extra lever hoods.
YMMV.