[Vwoolf] How did VW and LW send corrections to the printers?

[Edward Mendelson]

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Probably the answer to this is staring me in the face from inside the 
volumes of Letters, but I haven't seen it, so here is the question:

In what form did the Woolfs send to their printers, R. & R. Clark, 
corrections that they wanted to see in already-printed books (NOT proof 
corrections in books not yet published, but corrections or revisions to 
books already in print)?

I've seen lists of corrections sent to the same printer from another 
publisher, Faber & Faber, during that period. The lists were typically 
in this form:

Page 100, line 10, change _this_ to _that_ [i.e., the affected words 
underlined]

Page 200, line 20, insert comma after _something_

Do we know what the Woolfs did in the same circumstances?

To repeat: I am NOT asking about proof-corrections made before a book 
was published, but about corrections intended for an existing plate or 
for a photo-offset page, as in the correction made in the second 
printing of Mrs Dalloway from "Brooks's" to "White's".