Find an antler with a curve about the width you desire for your drawer pull. Antler sizes and shapes vary considerably, so you may have to weed through several to find one that works.
Cut off a chunk of antler the size, shape and correct curve for your drawer pull using a band saw.
Sand the two cuts flush with 80-grit sandpaper. The two ends should sit flush against a level surface when you are finished.
Drill a hole in the center of each cut with a drill bit one size bigger than an 8-32 threaded rod.
Mix two-part epoxy, and apply it to the inside of the drilled holes and on the part of the threaded rod that will go into the holes.
Press a 8-32 threaded rod into each hole, and hold it until it begins to set.
Drill holes in the drawer face that correspond with the threaded rods.
Insert the rods into the drawer holes.
Secure the pulls with nuts.