Pretty sure I learned this set-up from Andy (along with a boat load of other stuff . . .). Okay, I remember now that the bolts screw up through the threaded nuts welded to the underside of the subframe. I was still nervous about them loosening and topped them with flange nuts. The bolts are too short to fully engage the "locking" nuts, so I drenched them in blue LocTite. Like Andy, been there > a long time < . . . I just measured and this drops the front of the battery basket 0.