If it is 3/8" the easiest way may be to use a piece of left over click-
lock style laminate flooring. *I had a piece left over from a project. *
It was the perfect height for my saw. *I trimmed it to fit, dropped it in
place and moved the fence over it so it would not raise up, turned the
saw on and ran the blade to it's highest level. *ShaZammm! *The perfect,
strong, slick zero clearance insert!

Hmm, thanks for the tip, but I don't have any of that material.
All our floors were hardwood, oak. Might be about to use those
by the way. Will check it out.

MJ