Thanks both. I'd have to assume that the existing holes are already into the studs but not sure how I can tell. Does knocking on it produce a deader sound than hollow? That doesn't seem to scientific though. I think I have a device in the garage which might have stud finding capability, but given CGNs link (which confirmed my own concerns) I'm going off the idea of a cantilever anyway.
Glad I asked, thanks for the help. :-)
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