As far as I can recall, this is the first time I have ever heard anything even approaching negative re Bill, Tracy, or their Zipper bows. I have seen and talked to them at a number of shoots over the years and seen (and even handled) an untold number of their bows. This fine couple and their beautiful bows are so well liked and highly respected by trad folks in general it's almost unbelievable. I am sure that not only will this slip and subsequent apology (by both parties) not only NOT hurt anyone but will only serve to point up (further) the positives about them, their bows, and their service. Good thread and apology - and "fix" offer.
My continued respect and compliments to all involved FWIW.