Pivot and Plane Golf Trainer – mid 1980s Need Instructions – Clear Plastic Sheet with lines – mounts on mirror?

This a training aid I bought from a place in Florida. It has lines on it to help determine proper golf pivot and swing plane. I lost the instructions and am not exactly sure how to use. Anyone have the instructions or can help me figure out how to use properly?

Plane Stick Golf Swing Plane Training Aid

Tags: aids, dvd, golf, instruction,, swing