Put this:
Onto:
Put the eye of this into the hole saw, and stick a bolt through that hole in the side, making sure to go through the eye.
Dont hurt yourself. It works better if you grind off the teeth and make sure the bolt is the right length. Otherwise you can hurt yourself.
We use a 3" hole-saw bit, fit around the eye with a bolt running through the 'speed hole' in the hole saw bit. It works great until you hit a rock or a root and then the drill beats you like there is no tomorrow. Or until the hole saw bit breaks off the mandrel.
I have a vision of a machined...
We have been doing a lot of blown over spruce trees lately. We use these:
They are ok but its no easy chore spinning 3 much less 12 of them into the ground. We have a ghetto driver bit but its kind of violent and breaks, needing replaced often.
Small $4.95 = 500lbs
Large $7.95 = 2500lbs...
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