Had to order a throat for my MK8 extruder and got the 50mm one. Since the original Geetech one is 38mm, this makes the ZStop adjustment screw a tad small to reach the ZStop switch. So I added this extender and made it adjustable in height so that the adjustment screw could reach the switch without compressing the spring too much. In fact now I have 2 springs in place and it gives me proper tension.

Because of the clearance the connection tabs of the switch have to be twisted outwards as in the picture. Not a big problem. You will need 2 more M2 screws and nuts to fit the switch on the extender.