It looks like a converted clutch assembly, but is direct drive now..? I’m not sure if you can even clutch it?
http://31.media.tumblr.com/c6aaaa5de871478fe9fb3ce34f7d1c8b/tumblr_mrxucdlIK61speilco1_500.jpg
http://31.media.tumblr.com/f838430a01a240146be54d56dc1609f0/tumblr_mrxuaad7Xs1speilco1_500.jpg