If you get a few turns, you can always get in with a hacksaw blade. 2 Pack Toilet Tank to Bowl Bolt Kits, Heavy Duty Bolts Toilet Bolts for Tank Solid Brass with Extra Long Nuts Easy to install and Double Gaskets for Fastening 4.7 out of 5 stars 256 $15.99 Always renew the donut washer and bracket assembly as it saves a call back later. Good Luck... You can use a power tool called a Roto-Zip with a metal cutting blade on it or a multi-purpose power... How Do I Remove A Rusted Nut From A Screw Under The Toilet? Toilet anchor bolts hold your toilet to the floor and keep it connected to the flange, which is the opening to the waste line. Answer (1 of 8): Possibly:Soak the threads with WD 40 and let sit for 30 minutes or so. What Are The Steps Involved In Replacing Them? The wingnuts securing the 2 parts are rusted solid.