"Silvan" wrote in message

I've never seen MDF outside of pre-fab el-cheapo furniture. I have a
couple
small pieces of 1/2" baltic birch ply and three or four small pieces of
3/4" red oak ply. That's it at the moment.

Home Depot $6.49 for a 2 x 4 sheet of 1/2"

I made 6 inserts, then I made a sacrificial fence for the table saw and I
still have half of the sheet.

Email me with the size of your insert and your address and I'll send you a
piece to make an insert.
Ed