I have a toilet on the ground floor of my home that was installed with a lead insert that passed down through a hole in the slab to a 3 inch drain pipe. Over time the insert has fallen apart and now you can't fasten a flange down to it, so of course the toilet rocks and leaks. I have removed the lead insert to discover there is a four inch drop through the slab to the PVC drain. The hole in the slab is is small enough that there is very little wiggle room. I cant get a fitting through the hole to attach a PVC flange. Short of starting to break through concrete, anybody got a solution?