I have loved an Underground Wave Tray for two seasons, but since I broke the nose off it in some shallows, I thought; "Hey?! How do they do things?" Smart fellows.. Here's their inserts.
And one of the smartest things is the use of HeliCoils for threads rather than other types of inserts. I've found about five kinds of 1/4-20 inserts ranging up to $1.40USD some SS, but the HeliCoil is quite reasonable.. and in the two years I've flogged this board - no signs of weakness.
......while I'm doing an autopsy - anything else to be seen?