Ultrascale make the [engineering plastic] worm and wheel supplied in most
kits. Their web site is at...
Click on products. There is a scroll-down menu with gears towards the end.
Other than the modelling suppliers already mentioned, you might also
want to look at gear suppliers like
Muffett - http://www.muffett.co.uk
HPC - http://www.hpcgears.co.uk
Muffets have an online catalogue where you can download .PDF files of
their catalogue. HPC don't have an online catalogue, but you can get
a copy of their catalogue sent to you for free (800+ pages!!!).
You will find that the smaller size ranges from these suppliers will
suit 7mm scale. They cover spur gears, worm gearing, bevels,
helical and cross helical, etc. and are provided in a selection of
metals, and plastics. They also supply moulded plastic gear sets.
They are quite happy to supply small orders to modellers. I've dealt
with both and had no problems - quick service and they respond to
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