There is no way of adjusting the split nut I an see. The lever arm and the disc with the two pegs for lock and unlock is all that is there. I thinking filing the top holes the screws fixing the apron to the saddle go through so the apron came forward a little bit sorted the bending of the lead screw out.
Obviously the basic model is very basic. At least i knew what i was probably getting into and if the small problems i have encountered are all that there are it will certainly do for me.
MZ Rider