Reply To: Bow Saw
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Hi Steve,
The strings are tied in a loop around both top parts of the saw. A toggle or paddle is inserted between the strings and rotated (say clockwise), turning the strings (passing both sides of the paddle), therefore twisting the strings and shortening its length, tensioning the upper part of the bow saw by pulling both top parts close together (inwards). The bottom part of the saw, with the blade, is therefore tensioned because it is pulled apart (outwards).
I use a braided fishing line instead of a hemp twine: it is stronger an lighter. But it is possible to use a metal rod to tension the saw. The saw must not be tensioned when not in use, so the wood will not be bent by being too much time tensioned.
Please see more details here:
http://www.popularwoodworking.com/techniques/bowsaw_basics
and here:
http://www.toolsforworkingwood.com/store/more/bowsawdesign.html
Also, there should be more info in the internet.
Regards,
Ricardo