There really isn't just a 'tension saw', its more a group name. my closest answer would be either a hacksaw for cutting metal or plastic and a coping saw which is for cutting wood.
To hold the blade and tension it..
Hacksaw
There is no such thing as a maximum tension. That depends on the ability of the saw to apply tension-an 18 inch industrial saw can apply more tension to a blade than a 6 inch hobby saw-and the ability of the blade to withstand tension before snapping. The blade's ability to accept tension depends on its size (width and thickness, not length) and the material used to make the blade. A 2 inch blade withstands more tension than a one inch blade of equal thickness. Some steels and carbide are usually brittle (accept static tension) while others are more flexible and better at handling tension while moving.
It depends on what is wrong with it.
A Hacksaw has a thin, flexible blade - held under tension by a screw mechanism. A tenon saw has a broad, rigid blade.
Unscrew the handle to relive the tension on the saw. Remove the old blade, hook the new blade over the pins on the saw and tighten the handle back up.
The handle unscrews which releases the tension on the blade. There is a pin through each end of the blade that slips into a notch in each end of the handle.
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My best recommendation is to take it to a certified shop, the tension screw base is located beneath many other adjustments dealing with timing. Tampering with other adjustments may leave your saw non-functional.
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tension
i be blocking my tension