So far so good. Used to make a prototype mortise lock and tenon using a plunge router, a set of bushing guides, this attachment along with a template I made from birch plywood. The spike is 1 1/2" long and this bit cuts easily and accurately through a deep end slot. I'm hoping it will hold about 25 more joints and I'll consider it worth the money. If not I'll edit that Contribution.
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