I did my car today & reused my ignition by removing the spring & pin. Everything is working fine & the only trouble I had was reinstalling the black collar. But after much frustration I did it. I was wondering if it is necessary to remove the black ring & tumbler assembly to take out the complete ignition unit? If you are reusing your ignition & not replacing any parts & only removing the spring & pin? The instructions & pictures made a difficulty job easy.