Most staircases have some kind of newel caps on the newel posts.
I can make replacement newel caps for your staircase. Perhaps they were removed by a DIY enthusiast in the past. Ask a neighbour if their newel posts are complete, take a photo and e-mail me the digital image, J-Peg preferably, and I will let you know how much, or little, it would cost for me to make a replacement cap for you. Don’t forget to supply the dimensions for the newel post and the cap. Also, if known, what type of wood you require.
I can also make caps with a more unusual design. What do you have in mind?
These two caps are both variations on the same theme. They are square with rounded corners. The mouldings match the originals and the undersides have a rebate to fit onto the newel post. One has a more pyramid shaped top, while the other has kept a more defined flat top. These examples were from sets of caps that I made for staircases in extensions. I made them to match the original caps using photographs supplied by the clients.
Quite often the same design can be made in pitch pine, Scots pine, oak or mahogany. I can also make them bigger to suit larger posts. Not all designs, however, work in a smaller size.