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Tamiya Box Wrench
polished
strap
nearly
The stages for the F1-style air wrench are:
Cut some off (a hacksaw is better than a Dremel for this);
File and polish;
Build up the housing with styrene;
Paint it, repolish(!) and varnish to finish it.

You need compressed air for this, so here are some cylinders.

A diagram is here.

The finished article is here.