the 8mm hole in the coupler was under size ( 7.8-7.9) so the threaded rod was a very tight fit which i had to force in.
so i tried to drill it to 8mm

went in ok but snapped coming out.
recently upgraded to lead screws and new black couplers
but now i managed to snap a pin on the y axis end stop

. Does anyone know which end stop i need to buy to fit the GT2560 as it only has 2 pins and the ones im finding on amazon and geeetech site are 3 pins and dont look like they will fit where my old ones are placed?