AnyCubic Predator End Stop Shims

Some AnyCubic Predator (D) printers have problems detecting the end stops placed on the pulley sliders. The end stops are black metal pieces attached to the top of the pulley sliders. The base is attached with a pair of 2mm screws. The vertical part of the end stop is supposed to poke into the bottom side of the electronic control box (ECB) and break the beams of three optical limit switches. The end stop is shown in the photo marked "A".

The problem is that the ECBs are not adequately