....went out with "high button shoes". I had this proven
to me over 25 years ago....back in the old days....idle
bar plugs were considered r/c plugs (with throttles) and
non idle bar plugs were used in control line planes....
(full throttle)....I had a friend who started competing in
c/l "carrier" events....where the planes had to run several
laps at high speed....and then real slow (throttled down)
for landing.

He found out that the non idle bar plugs were far better
than the ones with the bars. He asked me "why would
you want to block the fuel....from the fire" ? Made sense
to me....and I switched. Yes, exposing the fire to the
fuel....without a barrier is a good idea....

Dave.