I made a modification to my bird feeder to make it squirrel proof . If it works well, I'll make several new ones. In a normal bird feeder there are two pieces of glass that rest in slots on either side of the feeder. The glass rests in the slot about 3/8 ths inch or so above the floor leaving a horizontal slot which allows the seed to come out onto the floor. In the floor of this horizontal slot in a straight line, I drove a series of one inch nails about
3/16 inch apart and 3/8th inch high just far apart enough to let the seed escape but nor wide enough to let the squirrel get his hand and fingers through. I then replaced the glass so that the bottom of the glass rests on the top of the nails about a half inch above the floor. This seems to work for the squirrels. At least it slows them down almost to a stop. I saw one sitting on the floor of the feeder for several hours taking out one seed at a time which I can tolerate, I guess. I'm not sure I won the battle, yet. This probably isn't an original idea but it is for me.BJ