Infinity Stick Grip

I am installing an Infinity stick grip in my -4. The plane has what I believe is the original Vans wooden stick grip on it (I am not the original builder). I don?t see any screws on the grip to remove from the tube. Are those grips glued to the tube? Any builders out there that can provide some insight would be greatly appreciated. Not sure how I would remove the grip if it is glued on and likely will have to get a new stick tube.

Thanks

If you aren't going to re-use the wooden grip, your drill should make the job of removing a bit easier.