If you had trust bearings delivered, then you can apply tension from the outside, by putting a trust bearing and a lock collar at each outside of the leadscrew. You may have to change the 40mm spacers into 40mm spacers + 6mm spacers, and the 50mm screws into 55mm screws, to allow extra space. A hexagonal nut may be included in the kit to bring the leadscrew under tension before locking the lock collars agains the trust bearings
Configure your full parts bundle to build a full machine (clone) like the x carve style cnc. Works with cloud-based software: