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Only place I've found them is surplus stores, way too heavy or so light and flimsy they dull with the first cut.
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Todd;
The Ontario is a fairly heavy blade, the Collins is lighter and more flexible. Either will hold an edge (if you don't burn it up with a **** grinder). As a general rule; the Ontario will break if pushed too far, the Collins will bend before breaking.
I am sure there are some other fine brands out there, but certainly stay away from cheap. I seem to recall that there are some blades made in Brazil that worked pretty well.
I can't imagine how a blade would bend double without bending or breaking unless it was paper thin.
As I use the machete exclusively, I need the heavy (Ontario) blade to chop through bigger stuff than the guys who pack saws, brushcutters, ect.
Does anyone recall the final fight scene in "Rob Roy"? Tim Roth chose the lighter blade, while Leam Neeson chose the heavy blade. Sort of like that.
The Ontario sounds different than the Collins. A Collins will "ring" when in use. It is much more asthetically pleasing, very much like music. The Ontario, being heavier, makes more of a "thwack" when in use. More visceral, you feel it more than hear it. (Sometimes I think I have spent too much time alone with my machete!)
I have used cane knifes and bolo blades from time to time. I found the cane knife to be too short, also awkward to carry, and never could grow accustomed to the feel of the bolo. The bolo carries a lot of weight on the end. Some people like them.
Many people see trail cutting as work, to be avoided at all costs. These people will never understand the rewards of swinging a fine blade. At best an exhilarating, almost religious experience.