This saw has an aluminum frame, knock-offs have steel.
These knock-offs may be licensed to use the name "Sven Saw".
20+ years ago I used a
Sven and it worked OK. But the triangular
shape does limit the stroke length on larger diameter logs.
The
wing-nut for tightening was a critical part that
could be lost.
I did not like that part of the design.
Sven does
not keep the blade in very
much tension, like a bow
saw would, or even a buck saw (Trailblazer). Loose saw blades break easier.
http://www.wscsurvivalschool.com/wsc/wsc_products/sos6003.html
The
Trailblazer comes in two sizes and these are what I have for
emergency use, now. I have hardly used either Trailblazer enough
to say they are better than a Sven. It reminds me that I need to
do some experimenting. I just got out my small Trailblazer and put
it together. It has more parts (than a Sven) and the parts should be
color coded as to what goes where. I will use colored tape for that.
The
wing-nut is foolproof, it is always attached to the tightening bar,
and cannot come off, without super human and super stupid actions.
In the field, if a critical situation is approaching, you might want to assemble
your saw ahead of time. Imagine that you fall though ice, up to your waist,
20 mph wind, and 0 degree F : can you assemble your saw now?
If so, will this take away precious time and energy from other fire building
activities?
A bow saw is always assembled.
If you are doing modern backpacking, you rarely need any saw; any of these
saws can cut a lot of big wood, Consider a smaller lighter folding saw; they
are quite versatile and can often cut "around" a log.