Be extremely careful not to let the carriage slide off the end of the rail. This could result in loss of bearings.

Each M3 x 8mm SHCS goes through an M3 Lock Washer before going into the counterbore hole. See picture for fastener stack for the linear rail.

The lock washer is critial - omitting it will cause the screw to bottom out and not fastener the linear rail correctly to the frame.

Slide the extrusion up against the top end stop switch holder, and center the linear rail on the width of the OpenBeam extrusion.

Starting from the end , PRIOR to installing the M3 x 8mm SHCS and M3 Lockwasher, insert the 2mm hex driver in to center the nut under the counterbore hole.

Drop in an M3 x 8mm SHCS and a M3 Lock Washer, and lightly tighten the screw to hold the rail in position.

At roughly 25, 50, and 75% down the rail from the end stop switch, insert the 2mm hex driver (prior to screws being dropped in) to re-center the nuts underneath the linear rail.

Drop in an M3 x 8mm SHCS and M3 Lock Washer in these positions and lightly tighten the screw.