How the heck fire do you properly reattach the white plastic bushing that holds the regulator arm to the window channel? Someone must have posted a DIY on this somewhere but I have yet to find it through the search.

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1981 300TD
2005 C55
2004 E500
1999 ML430
1992 400E
1998 C43
2001 SL500
1988 300SEL
1986 190E 16V
1991 190E 2.6