Thread the nuts and washers into the two M10 threaded rods separately. The orders should be:
1.Thread the Y plate connecting plate in the middle.
2. Thread the M10 washer – spring washer -M10 nut – M10 nut – M10 washer on the left
3.Thread the M10 washer – spring washer – M10 nut – M10 nut-spring washer – M10 washer on the right
Learn about brass reusable fittings in this procedure video.