22-09-2020, 02:06 PM
Before you reach for the die, the furniture trade do a barrel nut that reaches up through the channel to where the good threads are. I note they are available in 1/4" 6mm and 8mm.
https://www.ebay.com.au/itm/1-4-M6-M8-M1...0677.m4598
https://www.ebay.com.au/itm/1-4-M6-M8-M1...0677.m4598