pj wrote:
Can I cut through hollow-core closet doors (sliders) with a utility knife? I
would like to put pulls in them, and I don't really have a way to cut the
holes any other way.
-- pj

Use a wood screw (or lag screw) that's thick enough to "drill" your
hole. Utility knife probably won't give you a good finished look after
you're done.

FC