Tekki Shodan, previously known as Naihanchi is one of the most maligned and mis-understood kata that there is.
When Karate kata bunkai are taught there is usually some nonsensical stuff taught for this kata.
Far from being a method of fighting in narrow alleys, on the walkways between rice fields, or sitting on a boat/standing on a Chinese Junk, this kata displays the techniques and methods that are indispensable in grappling.
Nakayama sensei in his Best Karate books claimed that one should turn the head briskly as the kata was tedious. Tekki Shodan is a work of art. Claimed by Motobu sensei to be only thing you would ever need, and Funakoshi sensei trained in it (or the Naihanchi progenitor) for 9 years. Something this sublime should be studied and restudied.
Iron Horseman level 1 is John Burke sensei's book demonstrating the grappling techniques of Tekki Shodan.
With short sections on history and background, the traps, locks, chokes and strikes are demonstrated in pictures with the help of Richard Carrick sensei.
Learn why you want to step sideways. Learn what nami gaeshi is really for.
You can download the book here, or buy a hardcopy for £14.95 (approx $22) now from this site for no delivery charges
Tekki Shodan Application DVD has John Burke sensei demonstrating the techniques in a no-nonsense, no frills manner, just as though you were there in the dojo with him.
See if you can identify how "the invisible choke" works.
At around an hour long, this DVD showing just how the un-balancing and disrupting techniques can be used represents excellent value for money at £19.95 (approx $27)
frills manner, just as though you were there in the dojo with him. 
