You mean the Spock/Gock/Splock/Shock? There'a bunch of names for it. The little 6 inch drum that goes in the middle? You can't just "snap" it on. You have to by the
Yamaha Spock (with the attachment to put the spock on -- There's a couple of threads around here about installing Spocks onto drums. It's actually quite easily. Just slide it in from the side of the Bar [You'll have to remove the part that connects the 4th drum or the 3rd drum to the carrier bar]). Not just any ol' Spock.
Yeah, Spocks give a nice little 'spock' sound and are great for accents and just accentuating the music. Plus, 5 drums are better than 4. This season you'll probably have to wait to incorporate the Spock into your show until next year.