I got a new door seal for my car and yeah, it's kind of on okay, it's just not on 100% perfect.

There's the plastic part that goes beside the rubber seal (photo shown). Am I supposed to put the rubber in first then the plastic part, or the other way around? Very tight fit in there despite the fact that the plastic is very thin. Is there some specialty tool to do this properly?

Thanks,

jeff W124, 214k

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