I've this horrible premonition that all you did was "Break" the front of the tumbler.
(and you're gonna have to "Take the Road Less Traveled"...Removing
the Whole steering lock tube to be able to get to the Ignition Tumbler AND
replacing the SLT and the Tumbler)

You should press BOTH the "Legs" of the tool together to help push the detents.
AND press them towards each other.

Somewhere in the archives are instructions from one of the Ozzie members,who
ended up removing the "Guts" (spring and locking bolt) from his SLT ...then his
tumbler didn't have to "Throw" or "Retract"that 1Lb bolt every time the key was pulled out or inserted.

I believe the reference was to using a "chisel-like" hand tool to force the collar to turn(NOT the recommended approach).I think if the detents will not release with the angle ended u-shaped tool...you'd destroy the car trying to turn the collar by force.That collar is made of some materiel from another
Galaxy,It is the toughest piece of Metal I've ever run across.

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'84 300SD sold
124.128