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Finding a high quality 3/16-inch (or 5mm) chair slat mortise chisel isn't easy. We have asked Swedish toolmaker Hans Karlsson to produce a dog leg chisel specifically designed to clear the bottom of 3/16" slat mortises. Like our other Karlsson tools, H-142 is sharp and ready to use. After Hans Karlsson taught Toolmaking for Woodworkers last summer he stayed at Country Workshops 2 extra weeks and participated as a class member in our ladderback chairmaking workshop. This was an opportunity for Hans to actually use the fine drawknives that he makes for us, and to check out other tool making possibilities. One post-and-rung chairmaking tool that is needed but challenging to find is a properly designed and made 5 mm (3/16-inch) wide mortise chisel. These are used for chopping mortises in the rear posts for the back slats. After returning to Sweden Hans worked out a design and made a prototype which was sent to us for testing. It was not surprising to learn that the tool is excellent. It is stout, and comes with a heavy brass ferule at the striking end to protect the handle. Length has been kept rather short; as a chisel gets longer it becomes less stable and more difficult to control. The blade tapers on both sides just slightly towards the back. This prevents jamming in the mortise, and provides an opportunity to do a bit of corrected steering during the mortising process. The prototype passed all testing requirements. These are now in available.
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