Yes pretty much. Alternatively you could tap 1/4-20 threads into the accessory mount, then run screws in from the top and not have to mess with nuts. You can see this done in the GX460 video about the 3:15 mark ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-r76AqVqM28w.html
