try inserting bigger and smaller wires in. i used a small (and i mean tiny0 hex key that i bought from the hardware store. the thing is when i changed my tumbler the hex key fit in the old one, but was too big for the new one. if u get it inserted, it should be really easy to turn.

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198? 300D ???K - Future DD
1989 300TE 285K - traded in '12
1984 300SD 186K - Sold in 08
1978 300SD 330K - Died in 05