hi, if the board is older and not worth the time to route out and refit another plug i have succesfully drilled a new hole on the other side of the plug and put in another grub screw , so in effect its like the rear plugs,
just find a drill size thats a tightish fit in the original grub screw hole , i placed another drill in the original hole just to give me an angle visual to drill to , the plastic is soft enough for the grub screw to cut into, job done , pete