you may find it helps if you drill the diimple in the top metal assembly where the bearing sits a little bit deeper. I'm talking a "very little" bit deeper as sometimes the molding process does not make this good enough when they make the part. I would recomend using a drill press and be very gentle while doing it as the metal is soft and if you push down too hard you'll take out more material then you need to and might cause it to not work.
A 1/16" round dremel bit should work really well for this as it's perfectly round unlike a regular drill bit that the head is not perfectly round but a weird eliptical shape.
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