>>7348128>>7348058Check this out:
http://blog.livedoor.jp/hacchaka/archives/51972679.html There's a variety of shield poses shown off, and as you can see, there's two ways to connect to the arm. One is via a handle, pegged into the bottom of the shield, which allows for holding the shield out in front. The other is a balljoint in the center of the shield which attaches to the forearm. If you wanna get real deep, another figure, Gogg, has a handle that plugs into the balljoint hole for a third option.