I need to replace door handles on interior doors - have removed old privacy door knob to find a 50mm hole that goes all the way through the door. I wanted to fit standard lever handles in place of the privacy locks but because of the large hole the handle cannot be screwed onto wood of door. Any ideas of where i can buy handles with large diameter rose or does anyone have any idea what to use to fill the hole?
I doubt you will find handles large enough to cover that hole.
Pick the handles you want to fit and the find a local sheet matal working firm and get them to make cover plates in the same material.
I wouldn't head over to the sheet metal shop just yet. Have you tried looking online google "Ironmongerydirect.co.uk"
There are many different type of handles, that might have you thinking twice about going to have a custom built backing done for your door.