In article . com,
K7ITM wrote:

-- You can wind coils with nice even spacing by winding them on the
threads of a bolt. After you unscrew the bolt, if the wire diameter
is fairly large for the particular coil diameter, the coil may well be
self-supporting enough to be useful as-is.

An article with some graphs showing the inductance and Q of coils
which were wound on commonly-available bolts is at

http://www.radagast.org/~dplatt/hamr...rted-coils.pdf

--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
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