How do swinging chains and swinging spikeballs work?

[Kyasarin]

There's no page on the Wiki about this, and looking at Castle Eggman Zone didn't help me.
Basically, when I place one, they simply appear invisible, with an error, such as this:

Mace chain (mapthing #1208) needs tagged to a #9 parameter line (trying to find tag 0).

 

[Blade]

I haven't made any yet, but I think the Thing's rotation Is used as a sector tag, and then you make a control sector with Chain Parimiters with the Things rotation value as the tag. Linedef length determens how many chain links there are, I think.