This article is from the Fencing FAQ, by Morgan Burke with numerous contributions by others.
Every fencer needs a small toolkit for equipment maintenance. The
following tools and supplies are essential:
-- precision screwdrivers for point maintenance and
assembly; also handy for body wire repair.
-- pliers for tightening points; wire cutters are also
useful, and are incorporated into many pliers.
-- Allen wrench, screwdriver, or socket wrench for pommel nuts.
-- quick-drying (eg. cyanoacrylate) glue for emergency wire repairs.
-- cloth tape for insulating foil tips.
Fencers who do a lot of maintenance will also find the following
-- metal file for fitting tangs into guards/grips.
-- hacksaw for cutting tangs down.
-- blade-bowing tool (see 2.12) for gluing.
-- scraping tool for cleaning old glue out of grooves; an
old jeweller's screwdriver will do, provided you don't mind
ruining it. Utility knives will also work.
-- Lighter for burning off wire insulation or softening springs.
-- vice-grip pliers for heavy-duty work away from a work bench.
-- Swiss-army knife for everything else.
-- weapon-tester box.
Serious armourers will need many other tools, including:
-- workbench with vise.
-- ohmmeter or multimeter.
-- mask tester.
-- metallic fabric tester.
-- body wire tester.
-- set of weights and shims.
-- soldering iron (light for wires; heavy duty for pistes).
-- Dremel tool.