I have a very early reference to 'scowrer', 'scourer', 'scouring', but it's a bit difficult to figure out what is meant by the terms.
_Military Antiquities: Respecting a History of the English Army, from the conquest to the present time_, Volume 2, Francis Grose, 1619
“it is moreover requisite, that a souldier keepe his cocke with oyle free in falling, and his peece bright without rusting; neither must he want his necessarie tooles, as a scowrer, tirebale and worme, having every one a vice to turne into the end of the scouring sticke, so that if through wet weather, or any other accident, his peece will not be discharged, the skilful souldier may with his tireball pull out his bullet with the worme, the paper, and wet powder, and with his scourer make his peece clean within. His scourer must be trimmed on the end with a linen cloth of sufficient substance, therewith to make cleane the cannon of his peece within. The one end of his scouring stick ought to have a round end of bone of just bigness with the mouth of his peece, therewithall at his pleasure, to ramme in powder and paper, or instead of paper, such softe haire as they stuff saddles withall, the danger whereof is not like; but this the souldier must use when time permits.”
It's obvious that for him the scowerer and the worme are two different items, since both are mentioned in the list of required tools. I've been unable to find any definition of 'tirebale', but it's obvious from his usage that it screws into the end of the ramrod/scouring stick. It may be a gun screw/puller/drawer.
Spence