The only thing I could suggest is to mount it to the bottom ring on the base. Then have some friends hold the lid to the open hinge, so the angle lines up with the bolts in the ring and get the bolts started. Don't try and fully tighten it up just get it sung. You can then use the weight of the top to close the hinge. You can then get the spacer and nut installed on the bolt on the spring, inside the mount, to hold it closed. Then you can readjust all the ring nuts for a proper fit, remove the nut and spacer and then adjust the hinge for proper closing.