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Need New (and suitable) door knob supplied & fitted to the back door of house.

We need a New (and suitable sized) door knob supplied and fitted to the back door on our house. At the same time, we will need to make sure that the existing Or new door latch (if required) is sitting flushed and in alignment with the strike plate. Not an urgent job so timeframe not important. No dogs on property. I work from home so someone usually home through out the day. Simply, my Dad did a DIY job a number of years ago and used a different sort of door knob (it's a door handle at present). We need a sturdy and suitable sized door knob. God knows where the old one went.