Replying to Adding weight to the top of a glidecam?

Sorry if this question has been asked a million times. I don't frequent this forum too much.

I never really mastered my Glidecam 200 Pro0/T3i setup, and now I'm determined to get it right with my GH4.

I'm using:
Glidecam 2000 Pro
Panasonic GH4
Tokina 11-16 with ND filter
Rode Videomic Pro

Here's what I know:
Adding more weight to the bottom makes for easier stabilization. Cool, so I can add a lot of weight down there. But I need more weight at the top. The GH4 is such a small camera.

Any ideas for adding weight to the top of the glidecam? I'm not really sure what to do...I already have a mic up there. Right now my best idea is adding a battery grip, but that's just more money...

Looking for a more ghetto way I guess...like once of those weight bracelets for running or something.

Any ideas?

Thanks.