'ssgross':
Springfield stopped making the 'headless' cocking-piece because it cost more than the regular one.
The 'headless' cocking-pieces did not get scrapped or disappear. They did get used and reused.
When good parts were being refurbished to rebuild a batch of Krags, (at Armorys, arsenals, or depots), 'headless' cocking-pieces entered the 'mix' of parts. A 'headless' cocking-piece made in 1899, could end up on an action from 1903, during the rebuild process.