really ten hours? I am doing at least triple that. I don't really keep track of the hours, I just change them once the mulch is poor quality. If you are very picky about not putting rocks through it they last much longer.
I actually just did the blades in both my chippers today.... what a pain in the ass. On my morbark 2400 there isn't even any way to lock the drum that I can see. The chipper has been rebuilt and I figure there is something missing.... gotta weld something up I guess.
I got my last set of blades from wesspur, I bought the american made ones, they have lasted a good while. Wesspur is probably a long way to ship for you though.
Also if any of you need your blades sharpened and don't have anything local my salesman's father owns Filegar Cutting Technology (
www.filegar.com) in Jamestown NY. I have been shipping my blades to him and it is a quick turnaround.