[Solved] How to adjust the radius on a Warp "Hole" object

[Super Watermelon 64]

I'm not using ROM Manager to make my hack. I'm just using the normal tools (SM64 Editor, Quad64, etc)

I want to change the size of a Warp Hole object.
How do I do this?
I know it's possible without custom coding since the Dire Dire Docks suction tunnel can be exited (into the Castle Grounds) from any part of the black square.