I installed a toilet seat for myself today, with no problem. However, when I went to help my friend change hers, there was no way to get the bolts out. We tried screwdriver and pliers, and then WD40. No luck! So we called a maintenance worker in and he tried the drill, a vise clamp, and a pair of bolt cutters. Still nothing! The man called the property caretaker for advice, and he will be coming over to see what can be done. The old seat broke off the the plastic holder at the back, so we were really stuck. My friend just called me now and told me that the caretaker was there and he had it fixed in five minutes! I still don't believe it.