Chris Andrews navigates his way through the warren of corridors and staircases that sit at the back of Weir & Sons, the historic jewellery store in the heart of Dublin city, like a man who has spent his life careening through the building. And in truth, he probably has. Weir’s has been in business since 1869 and has occupied its current location on the corner of Grafton Street and Wicklow Street for the vast bulk of the period since (it was based across the street for a number of years before). Throughout all that time, it has remained within his…