>>8119126You see that technic connector with the two pin holes going on the two 3l pins? there's a raised part on the 3l pins that keeps the full-width technic pieces in place (it's why you can connect one only on the 3rd unit and then move it to the 2nd unit and vice versa and it stays there.) that raised place is depressed by the technic connector and causes stress to the piece. This is an acknowledged illegal connection by lego. "it fills out the hole pin" doesn't even make sense as a counterargument as it wouldn't even affect the structural integrity of the piece.
