I was changing my factory saddle out with a new aftermarket seat and I looked to see that dreaded blackhole and it appears to be just a depression so I didn't see the hole in the front of that depression until I hear the tink tink tink of my right seat bolt disappearing into the singularity. I nearly my pants envisioning a tear down of the entire rear portion of my Spyder. What I did find was the black hole ends in the rear tire wheel well and you can gently pry open an area where the panels come together and using a strong magnet (I have a number of neodymium magnets) the bolt slipped right out. Granted a non magnetic part will be much harder but a steel nut or bolt isn't that hard to retrieve. Trying from the top appears most difficult due to the angles. So bottom line trust the advice from the people on this board the black hole lives!