I'm trying to fix up my girlfriend's Salvi concert harp, but just as I finally got the whole thing stringed and tuned, another string broke, and sadly, we did not have this specific string in stock.
However, I figure that it can't hurt all that much to use a different string. She uses Bow Brand natural gut strings; we need a 3rd octave D, and I'm contemplating to use a 3rd octave E string.
Is this OK with a harp, or is this considered bad practice?