Years ago I've bough cheap cheap (~$10 I think), low power miniature drill/grinder for PCB drilling. It looks like this type of tool is still available with various brand names.
There were two or three tool adapters made from brass in set, for ~3 mm tools, but nothing that could hold 0.8-1.0 mm drills. I've used various combinations of paper/wire/glue/tape to make these drills fit, but it was not convenient and not reliable.
Luckily this grinder/drill machine can be combined with cheap mini drill chuck - I've bought "M8L"/"M8 Long" model for less than $2 with shipping included and it seems to be good fit. Nominal drill sizes range: 0.3 - 3.2 mm.
Not too precise, but as this drill/grinder is not too precise either and it is hand operated this is not a problem, especially if center punch or drill aids are used.
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