If a book is easy to write, I might say liber facilis est scriptu. Here the supine ablative scriptu is an ablative of respect (ablativus respectus). If I want to be more specific about my writing, I could say librum stilo scribo instead of just librum scribo. But can I use an instrument with the supine ablative as well and say liber facilis est stilo scriptu? I do not recall ever seeing such a thing, and it feels a bit weird. I think it is grammatical, but I want confirmation. Are there examples of such use in literature or is this discussed in some grammar?