I have just got my Sieg SX2P mill and have stripped it down for cleaning and ease of transport to the workshop. The leadscrew nuts have a slot cut across them and two small adjusting screws which can open the gap, which I assume is to reduce the backlash. With the screws fully backed-off (as delivered) the lead screw is a very loose fit in the nut. The question is how how tight do you make them. The leadscrew and nut are both steel and I could see wear being a problem, particularly as the adjustable "leaf" is only a couple of mm wide.

Further question regarding the leadscrew nut on the Y axis.

I have stripped down the base of my new SX2P Mill for cleaning and now coming to re-assemble it I can't remember which way round the lead screw block goes. (Always assuming it was assembled correctly in the first place). Is the slit at the back nearest the column or at the front. I have looked at the exploded diagram which seems to show it at the back but that may just be diagramatic. I remembered to took a picture of the X axis before removal, but again that assumes it was fitted correctly in the first place.