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
https://www.etrailer.com/Roof-Bike-Racks/Thule/TH518.html
Today we have a 2012 Jeep Compass and well be test fitting the Thule Echelon Roof Mounted Bike Rack part number TH518. To mount the Echelon to our Thule Roof rack, were going to fit the front clamp around our square load bar. Well use the included Allen wrench to tighten down the Allen head bolts and secure the front clamps around our front bar. In the rear, well take the wing nuts and the clamp, secure it around the bar and tighten down the wing nuts. With that, our bike rack is mounted up on the vehicle and were ready to load our bike. To load the bike, well place the front fork in the skewer and the wheel in the wheel tray.
Note: Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.