...which reminds me...
My cordless drill doesn't have those handy built-in spirit levels, on top and on the end, that are featured on some models.
It would be easy to let a couple of small level vials into the drill casing, and glue them in with the accuracy required, so it's just a matter of finding suitably small vials - either by cannibalizing something else or buying them as separate 'components'.
A two-quid fence post level will provide three linear vials for the top of the drill (one to smash while getting it out, one to smash while letting it into the drill body, and one that's just right).
But I can't find any source of *small* bullseye levels for the rear end of the drill. The ones in the usual electromechanical component catalogues are too big. Any ideas, please?