What is a shockmount? If want to record dialogue for your movie, using a shotgun mic on the end of a boom pole is a good way to capture it. The problem is that if your mic is connected directly to the pole, it will pick up noise from the operator's hands. A shockmount suspends the mic up and away from this potential noise.
A few years ago, I published an Instructable for a rubber band mic shockmount
that was became featured on the home page. I received positive feedback, but after finally using it in the field, I didn't like it. The rubber bands tended to move too much and the whole thing looked cheap. I think I've come up with a better build that is tougher, easier to make, and less expensive.