> As far as heating these things to red hot, that's probably not a
> good option, as the parts are ridiculously tiny.  I'm hoping I can
> use a heat gun to get it hot enough.

Look up figures for thermal coefficient of expansion to get an idea
of whether you can work with what you've got. A clockmaker friend
of mine uses a small butane pencil torch to place steel pins and
axles in brass chassis. You need only the minutest difference to
get an exceedingly hard grip on cooling

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