Clean all the parts with brake cleaner, then make sure they are dry. Use a new bottle of genuine red loctite, not some old bottle that you've had for years.
Use two grub screws, one on the flat side and one on the non flat side. You want to nip the flat side down, then the non flat side and then tighten them both up. Never had a pin come out with the above method.
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Kyosho RB6
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