Here's a pic of the "other" style, with the metal clip. Just wiggle that clip back and forth and the force of the spring will push it off.

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84 300D 255K "Mr B" ("Mr Becker")
79 300D 265K "Mrs B"
85 300TD 175K "Mali" (Sold)
74 Ford F-100 74K "Bonnie" (Sold)
67 Jeepster Commando (Sold)