I'm not sure what model of toilet this is since there are no markings anywhere, but it looks like it could be original to the house built in 1930. Perhaps a Standard Modernus? At any rate, we are replacing it with a modern low-flow toilet. The tank is separate from the bowl and they're connected with an ell. As can be seen the tank is bolted or screwed to the tiled wall from inside the tank. The tank is flush with the wall so I don't think it hangs on a bracket. The problem is that the heads of the screws/bolts are rusted. How can I detach the tank from the wall? Is there a way to drill the bolts out? There is no room behind the tank to insert a hacksaw blade to cut off the bolts. Thanks for any help.