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That is not what I had in mind when you said screwless face plates. You have wall-mounted junction boxes. Though it could work with yours (for very tiny stashes) I think this instructable was geared toward traditional junction boxes that are recessed inside the wall, with plates that are mounted flush on the wall.Can you post a front view of those wall-boxes?These are the screwless plates i was describing:
secret's out now. Thanks a lot.
the screwless outer trim just pops off. There is an inner piece that's held in with screws.
How to fix your check engine light.