SRc, take a look at castor mounds posting.That photo is one way I do it.Some of the photos have gone away.I will try to get Mike to post some more.
If you look above you will see Tom Olsons stabilizers.for my cator mounds,I use the 20 inch and also my patented Bogmaster BGM-2s.
Stability of your 330 is a key to smacking beaver.
Tom