Extractor for Quackenbush Bicycle Rifle, Safety Rifle, and Junior Safety Rifle. 3 dimensional drawings showing the relationship of the parts, known as Schematics, were invented during World War II and the Quackenbush guns were made decades earlier, therefore, no schematics were made. No additional parts hold the extractor in, it is just staked in. When the Staking wears, they fall out. All extractors are the same. The extractors we sell are not relieved for staking. it is up to your gunsmith do that. stake it in place, and adjust the length.
