I recently needed to drill holes in a tight location, where a pin vise was not an option; I had to drill around a corner.
I found a small (approximately 1/8" diameter) spring at the local hardware store. I removed the loop ends, cut the spring to about 1" and glued it onto the end of a 1/8" diameter, 3-1/2" long piece of styrene rod. The end of the rod had to be trimmed a little for a tight fit inside the spring. About 1/3 the length of the spring was pushed over the rod.
I then drilled a pilot hole into another piece of 1/8" diameter styrene rod with a #71 bit [the size needed for my project]. That piece of rod was then cut to a length of about 1/2 inch. The shaft of the #71 bit shortened and the bit was superglued into the pilot hole in the short piece of rod. Because the spring is a spiral, I 'screwed' the rod/drill bit into the spring, which holds the rod in place but allows the piece to be 'unscrewed' and taken out. Different sizes of these drill heads can be made using whatever bit you need.
To use the tool, poke a small pilot dimple (if possible) with a pin where you want to drill. Position the drill in the dimple, and use two fingers to hold the bit straight while spinning the handle with the other hand. This tool will get you into places you can't reach with a conventional pin vise." - Ed Maslin
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