A few years back I shot in a class where we used heavy spinning targets that required consistent, alternating hits to get it to spin. I have been trying to locate some of these but no luck. Has anyone else seen these and any ideas where I can get them short of having them custom manufactured?

Google "dueling tree" targets. I think that is what you are referring to.
Peter.

you are probably thinking of the MGM spinner

http://mgmtargets.com/gravity-moving/spinner