I bought a second-hand exterior door to replace the crummy thing the builders put in as a back door.
Trouble is, I was having a blonde day and my measurement was off (I think I measured the short side of the old door against the long side of the new one).
The result is, the new door is about 5mm too short. My question is, how easy is it to modify the frame, or is my only realistic option to go back to the reclamation yard and play "silly old me" and hope they'll let me change it?