Mounting Plug for Ineos Grenadier Barrier / Hanger Holes

Mounting plug that will take an M6 bolt, shown with a JCB / furniture connector bolt but you can use any M6 bolt.  JCB bolt can insert from rear, there is also space for up to a 16mm washer so you can insert a bolt from the front and secure to a nut on a washer to spread the load.  Barrier mounting hole is 13mm wide so a 16mm washer on a bolt would catch the load if the printed plug failed.  Shown printed in Overture PLA Pro Space Grey, 0.16mm layer, 50% tri-hexagon infill, 4 wall line count, normal zig-zag support.