Hi
The shackle is mine, it is rated, just old

It's been on my harness for years, never had to use it before.
While the one bolt is loose, it won't come out. The real problem is that the rings are screwed on to the end of the expansion bolts (This route is the only place I've seen this) and the expansion bolts are too long, and they project into the rings, making it difficult (read impossible) to get your rope through them.
Someone had tried to fix the problem by placing a U-bolt onto one of the rings, but they had placed it with the U-part through the ring and the locking bar at the bottom. So when you fed your rope through it, your rope runs over the locking bar and unscrews it... ...and you are only lowering off one anchor...
I guess that whoever put the U-bolt up there is really brave to lower off on only one anchor...
I have some hangers with rings and have been meaning to put them on the route just haven't been back for a while
Meanwhile did you see that on the route to the right, the hanger is missing from the third (or possibly 4th) bolt, making a huge leadout to the next one bolt, with a very good chance you'll deck!