Here is a post from Lee:

" Hello Aaron and All,

I did some testing with an inductor in the trigger circuit, although
this was not extensive. The inductor effectively delays the point at
which the base of the transistor receives enough voltage to begin
conducting. Without the inductor in the trigger circuit, the point at
which the base begins to conduct is dictated by speed and strength of
the passing rotor magnet. The physical geometry, gauge of wire and
number of turns in the coil. Also, the quantity of welding rod that
makes up the core of the coil. Increasing and reducing base resistance
has little effect on this point of base conduction but with an
inductor in the trigger circuit combined with base resistance, the
point at which the base conducts can be delayed, effectively reducing
pulse width and therefore, current draw.

All The best Lee…"