I just finished converting 2 dozen floaters to field mallards. The stakes that I made are from "upside down U shaped" steel rod support legs that political signs are attached to that people place in their yards prior to elections. I cut them 24 inches long, mark the middle and bend them in the shape of a "U" by bending them over a 3/4 inch bolt that is locked upright in a vise. This gives me a 12 inch support stake. Next, take a short "L" piece of the rod ( I use the leftover corners or "L" ninety degree corners of the signs) to weld at the apex of the stake which will be inserted into the hole (5/16") that is drilled thru the back at the balance point of the ex-floater. Clip off the excess of the top of the welded tip so you will only have about a 1/2 inch protruding up thru the mallard back.
After the decoy's keel has been removed by using a utility knife, being careful not to cut thru the bottom of the decoy, cut a narrow (1 inch) rectangular slit in the bottom, 4 to 5 inches long. I drill 4 holes and use a jig saw to cut out from hole to hole. You can probably use a utility knife as well. Find the ballance point by sticking a pencil with eraser up thru the slit til it ballances. This finds you the place to drill the hole(s) for the stake tip(s) to hold up the mallard(s). The stake will be inserted up thru the slit, into the hole and will give a motion range rotation of approx. 30 degrees. You can get more or less rotation motion by either opening or closing the width of the legs to the stake prior to sticking it into the ground. Spray paint the legs flat black.
You can view all the pics here:http://s766.photobucket.com/albums/xx30 ... om%20Made/
I went one step further by attaching legs made from orange pneumatic hose found at Harbor Freight. It is just the color of mallard legs. I drilled two small (3/16) holes where the legs would be attached, inserted 1/8 inch elastic cord thru the cut hose and then thru the leg hole, fished out the cord thru the slit, tied a knot in the cord, stuck two short pieces of shishkabob spears (takes up excess space) into the end of the "leg", stretched the cord real tight, cut the cord with enough slack to knot the end. Wallah!, Mallard legs that spring back when used with the stake and fold down when placed on the ground. Make sure cord is stretched to the limit before tying the knot. Also made feet, but that's another story.