Why the TCBOR gap?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <jim-at-jlproduction-dot-com>

Hi all,
I am just curious to know why so many people use the TCBOR type gap if
they are reportedly so poor in performance?
Certainly it cannot be ease of construction as I spent as much or more
time on that than anything else. Couple that with poor performance and I
wonder why do so many recommend them? This seemed to be the first and
only area that all you fellow coilers suggested I eliminate to get
better sparks/arcs. 
My plan today is to eliminate all but 2 or 3 or my 6 gap set up and see
what happens. If this is unwise, or a superior modification is popular,
then by all means do tell :)
Thanks,
Jim