Fortunately, this was noticed due to the rattling sound when the A was played unfingered before it had a chance to be noticed by a finger being stabbed by a stray bit of unwrapped wrapping wire. There was half a set of spare strings in the not-yet-restrung ¾ in the cupboard that Amos stopped playing last year but I'll try and work a trip past a string shop into Friday afternoon's other errands.