Rockler - Rockler- Insty Bit Tenon-Lok
When the Tenon-Lok bit is pushed against the bottom of a previously drilled hole, winged cutters deploy, creating the dovetail shape that locks in the tenon.The joint where a chair leg meets a stretcher gets a lot of stress and when it breaks, a long-lasting repair is challenging. But the Insty Bit Tenon-Lok promises to make this high-stress joint stronger from the start as well as fixing old chairs for good.
The heart of the system is a clever bit sized from 1/2 in. to 1 in. ($19 to $22) with two spring-loaded cutters. You first drill a straight, flat-bottomed hole, and then use the Tenon-Lok bit to flare the bottom. A sharpened piece of steel tubing, called a Wedge Ring ($5 to $8 for 12), is driven in as the stretcher is pounded home, creating a dovetailed tenon that locks inside the flared hole. Seating the wedge ring requires some force, but once you do, your chair will stand up to just about anything.
Fine Woodworking Recommended Products
Compass
Tite-Mark Marking Gauge
Stanley Powerlock 16-ft. tape measure
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