Mindful of the need to remove tool tray to access rear suspension, axle etc. at least once a year, I decided to fit threaded inserts into wood screw holes and use setscrews to retain tray.

I chose M4 inserts as front wood lip is relatively narrow. These screw into 5mm clearance holes in wood with hex key to sit flush. M4 x 16mm countersunk screws were found to be the right length to secure my aluminium custom tool tray. This worked fine for the five front and side screws but the single central rear fixing was as OE a longer screw at shallow slant angle into wood backed by aluminium. Here I had to be more inventive as the inserts simply wouldn't work. Eventually found that a 6mm hole allowed snug fit of M4 rivnut tapped into place with epoxy glue, and using longer M4 screw. Job done with no worries of worn woodscrew holes in the future.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone