How to loosen HDW8.8 Bolts (for rotating blades)
In order to rotate the blades on any of our chippers, you much use a hex socket (6 sided) with no leading edge, this is important or you will round off the head.
Sometimes it helps to tighten a tiny bit before undoing the bolt.
When the process is complete, use a small amount of thread lock and screw back into position.