Door bore hole too large for new door knob kits
I had a similar problem. I needed to go from a 2" hole to a 1" hole. I got a 2 1/4" hole saw and cut a hole through a piece of wood the same thickness as the door. I took the plug from the hole saw and glued it into the hole in the door. Sanded it, filled it in with a little wood putty and then drilled my 1" hole. Might be a little more work than you want to do but it did work.