the insert was received in time. It looks nice and has a smooth surface. If you look carefully you see the plate is not 100% accurate flat. It has a slight bent. I think it is possible to get rid of the bend by one extra screw in the middle. The rings can be mounted with only one screw since the distance of the holes are not completely aligned with the holes in the insert. I can probably solve this by drilling a bit bigger hole in the plastic ring. I used a simple router with the plate but will need to find another solution. being able to adjust the depth is a future that is lacking with this router.