Thread in 2x M3x6 brass standoffs into the bed plate.

Secure the end stop bump stop to the brass standoffs with 2x M3x6 Socket head screws

Take your bed spacer and secure the bed frame and bed spacer to the Y MGN sled with 4x M3x14 socket head screws.

Note the position of the bed frame. The MGN carriage screws are on the left and the belt lockers are on the right of the MGN rail.

If you removed it during disassembly reinstall the Y stepper motor and Y belt tensioner.

Reinstall the Y belt

Thread in 9x M3x10 standoffs into the bed frame and tighten them down.