Chris, If I may make the observation, you are too sad far too easily.
I own a copy of this book and knew its author, far too shortly; in fact I get an obscure reference among his acknowledgments.
The significance of the volume relates to its discussion of the 'tunnel effect', that slanting experience of consciousness that occurs when one truly transfers from the mode of 'ordinary' perception into one of an extraordinary reality. I must confess, being a child of the late 60s and early 70s, that my best and worst experience of this facility was due to psychedelic drugs: chucking oneself into the deepside, and the darkside (quite frankly the Tunnels of Set give an entire new realisation of the essence of so-called Qlippothic entity); a state of affairs of which Kenneth Grant did not particularly approve. Although he knew its effectiveness.
I believe that Frater Kyle is preparing an essay on 'The Sign of Protection' for the next issue of STARFIRE, and I anticipate that he will discuss these matters there. If not, I'll get back to ya....
Love is the law, love under will.