I recently tiled my bathroom and want to install a pvc flange adapter onto the top of the waste pipe. The waste pipe already has existing bolts that will be too short when I install the new flange. How do I remove the old bolts being that they are install with the head down through the slots with the threads up? :o

The Bolts Will Slide In The Notchs And Can Be Pull Strait Up At Those Points. They May Have A Nut At The Bottom Of The Threads That May Keep Them Tight Where They Are, Losing Them And Slide The Bolts To Where The Slot Opens Up And Then Just Pull Them Out, Put The New Ones In The Same Way