🔍 The centering pin is a small metal rod that fits into your router’s collet (in place of a router bit) to help perfectly center the brass guide bushing in the router base. You install the guide bushing in your router’s base, insert the centering pin in the collet, and then adjust the base or bushing until the pin goes exactly through the middle of the bushing opening. This ensures that when you rotate the router, the bit will be concentric with the bushing. A well-centered bushing is crucial for inlay work – if it’s off-center even slightly, the recess and inlay might not match precisely. The SpeTool kit includes this pin for convenience (some kits don’t, and users have to supply their own). It’s a quick step: tighten the pin in the collet, loosen the base if needed to shift, snug everything so the pin touches the bushing evenly all around, then tighten it up. Now your setup is aligned and you can swap in the router bit and begin cutting with confidence.:contentReference[oaicite:47]{index=47}

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