Hey guys can you give me an idea of what special tool is need to replace the tumbler on the 201's because i replaced the tumbler on my 123 with just an allen key. I tried the same method on the 201 but no luck ne info would be appreciated

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1982 300D Turbo (Mom's)
1993 BMW 525I (Dad's)
2001 Vw Golf (Brothers)
2002 Nissan Ser SpecV (Im the Black sheep lol)