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If you have compressed air, several options are available. The best cheaper tool (less than $50) would be a "die grinder", with diamond encrusted bits. The bits come in a range of sizes. Small electrical type kits with a myriad of attachments are only good for very small jobs as they don't like fibreglass dust at all.
You need a # 402 bit. This comes with a screw on top that detaches and goes through the hole in the cutting wheel (very small hole). Then just re-attach it to the bit and you're in business. Depending on the particular cut-off wheel you're using, the wheel can be extremely fragile. Even though it will cut steel, it is brittle. ALWAYS wear safety glasses when using a cut-off wheel particularly, they will inevitably shatter and go flying!
Probably best to go to a local hobby store, buy a few bits for $10, and pick the owners brain about the tool.
Unplug it, then while pushing in the little silver button near the head use a wrench on the hex nut and turn counter clockwise about a 1/2 turn. Push the bit in, then pull it out (that releases the little fingers that hold it).
The silver button locks the head so it won't spin while you are changing bits. Always be sure it is released before plugging in or turning on the power.