Some Japanese hand saws can be sharpened. If the teeth of your saw are not impluse-hardened (blue tipped) than you should be able to sharpen them using a feather file.
Feather files come in several sizes for different tooth counts. The three most common are a no. 3 (75mm) for dozuki saws (reinforced spine, fine teeth for crosscutting), and a no. 4 (100mm) for ryoba saws (dual-edge blade for crosscutting and ripping) and no. 5 (125 mm) for the more aggressive rip and cross cut saws.
To sharpen with a feather file, clamp your saw in a vise with the teeth just above the jaws. Because these teeth are sharpened in an alternating left-right pattern, you'll sharpen every other tooth from one side, then flip the saw around and sharpen the remaining teeth. Push the file across each individual tooth 3 or 4 times, more if necessary to repair damaged teeth. After completing this step, file tiny secondary bevels on the tips to avoid having them break off during use.
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If it is for sale in our store -- it is because we use it and love it!
We are happy to share our experiences with these tools which may enhance your own. Given care, maintenance, and love, each of these fine tools is capable of lasting a lifetime. We do limit warranties to those offered by our supplying manufacturers. If ever you have a question or concern regarding any of the tools we sell, please let us know.
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