Is this possibly why manufacturers put an M14 thread on them - because it's not compatible with chucks? I'm with BA - I have an angle drill and it's maximum speed is 1300 rpm and even at that it's pretty grabby, so a machine with a starting speed of 900 rpm is starting a bit fast IMHO. I'm also wondering how you'd hold it single handed. I'd have thought a proper close-quarter drill:
or angle drill:
which is designed to be held one-handed and used in confined spaces would do a much better job, especially as these units have a reverse - try drilling between joists and you'll soon realise why you need that - and also a very progressive speed control. All these angle drills are also pretty low power devices, again presumably on safety grounds. Failing one of those what about a right-angle head for a drill with forward/reverse? I know that AEG/Atlas-Copco (now Milwaukee) used to do one for their drills as did Bosch:
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