1974 Other Nissan Models Automatic Choke Relay

The Choke Relay switch on my 1974 Datsun 710 doesn't seem to be functioning correctly since there is no power going to the electrical wire that heats the choke. When I open it up there is a set of points that sit on top of a coil of wire. I can adjust the points but cannot find any information or specifications on how to set them or how wide the gap should be, or if the points should be touching to begin with. When they touch then there is current in the electrical wire that heats the choke. How can I adjust this Choke Relay? Any help would be much appreciated. Thanks! - John