Depends on tram issue. I put folded layers of aluminium foil behind the zslider at the bottom. A bit of a pain should i need to change the slider height but i am anle to adjust the spindle in its clamp which is sufficient for my needs. There is a 1F video about adjusting the screws on the gantry holding the x rail. Ive not tried that. I used my foil before that came out. Foil has now been in place for many months and resurfacing waste board still looks good.