just pull straight back. it will rotate on you, you just have
to be persistent. i use a small hook tool from cobalt. it will
snap out, it's just a c-clip, but can be a pain. sometimes
getting it back in can be a challenge too.

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rayroyw
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'85 380SE (238,300) my "new" old car!
'84 300D (303,000+)
'72 250/8 (mercy heaven)