It is common practice to make a new zero-clearance tablesaw insert from a factory insert with a pattern-following bit in a router. Most articles recommend joining the old insert to the new blank with double-sided tape. I find it a lot easier to attach the two pieces with four screws through the leveling holes. This approach is quicker and cheaper, and it also marks the new insert for its own leveling holes.
You must be a member to access this story.
Become a member today and get instant access to all Fine Woodworking content!