Blackhorn 209 year end shot
#11

The 1/8" drill is used to scrape, and remove the hard carbon that coat the wall of the flame channel, after shooting. The carbon build, will close the flame channel, and should be removed each time you clean the breech plug, by using the 1/8" drill. Some, including myself, use a 5/32" drill, because that happens to be the diameter of the flame channel in the breech plug i use.