I believe that the Little Cleo I used to catch my first trout was a 1/6th-ounce lure. I’ve also seen a few guys using flies with small bobbers attached to add some casting weight on their spinning rods. I tried a similar trick way back in high school, using a spinning rod with light line and tying a weight on with a wet fly attached to try to catch panfish in a spot where larger lures weren’t working as well.
The results were fantastic, and I caught several nice bluegill in the shallows as I lightly jerked the submerged fly back to me. The cool thing about using a small bobber as weight is it will allow the fly to stay afloat. Just be sure to give enough room between the bobber and fly so as not to spook the fish.
It’s unusual, but it works!