An option could also be 4140 steel which in pre heat treat or annealed is pretty tough stuff but can still be drilled with a good quality high speed drill bit if it's sharp .
You'll want to "step drill " it .In other words start with a smaller drill bit then progressively increase the drill...
Another thing you have to watch on those old chippers is metal fatigue on the chuting .Over a period of years they shake them selves apart .
It could really be bad if the feed table fell apart or the discharge chute gave up the ghost while running brush .I've welded them and the welds held...
That bamboo is some invasive stuff .It grows like a weed even this far north .
I'd imagine farther south if not kept in check it might get as bad as kudzu given enough time .
Toms lady worked as a brush dragger for another tree service before Tom snatched her up by paying more money .Once she forgot to tie up that shoulder length blond hair and a piece of brush darned near snatched her in .
Danged old chuck and duck is one piece of machinery you need to be...
A little word of advice .Use new bolts when you put the cutting assembley back together and grease them up with never-seeze .I've had to drill those damned things out on several occasions and it's a monumental pain in the buttocks .
You got to watch them because they'll suck a piece of brush in about a hundred miles an hour .If you're standing in the way it'll beat on you like a cat-o- nine tails .
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