David said:

TWS wrote:
I don't bother with zero clearance inserts for normal dados as there
is usually plenty of material in the workpiece to keep it flat on the
TS surface.

I agree. I have one homemade insert for all dado operations, regardless
of how many chippers are installed.

To each his own.
I personally prefer my 2x4s to have unfrayed edges. :-\


Greg G.