A quick learner from Milwaukee, WI 53202 says:
November 12, 2015
T-shaped cast configuration with a wood screw in the middle of the 2 sides of the T. it is in a recessed circular recession of the door frame and rotates into slot of the storm and screen insert to hold it in place
Paul from SWISCO responded:
November 13, 2015
How about our 70-003? Could this be what you need? Check it out and let me know what you think.