That link is super helpful, thanks! It's roughly what I thought pinning was, but pictures obviously help a great deal. What's a good way to tell if a joint needs pinning? The parasol replacement/fiddling makes sense, but, for example, sybelle's arm comes as a separate piece, as does seamus's hand/bag. Neither of them seem like they're particularly delicate pieces or supporting weight, so I wouldn't think to pin them. Should I?