After Nichola's adorable use of a chess pawn as a finial on her
Fairy Lantern, I started my search... alas, I couldn't find just pawns
from chess sets. But I happened on this set of wooden toy parts that fit
together perfectly and have the right silhouette.
(Or you could buy 4 sets - and not put them together - and you'd have four 1"-diameter wheels.)
Also shown with a Black Tea Lanterns (for scale).
1 set per package (2 parts).