Don't know about anyone else but I found that the standard L-Plates that you can buy tend to break after a couple of 100kms if they are only fixed at the top.
They bend fatique and break (Although this could just be a clever design feature to stop you exceeding 70Km/h).
Cure: I purchased a yellow plastic kart racing plate from my local kart shop. I purchased two number '1' racing numbers and stuck thes on to make and 'L'.
Kart plates are much heavier duty than the plastic that the L-Plates are made of. Kart plates are traditionally mounted on the back bumper and are frequently rammed by the front bumper of the kart behind - so they are made to endure some abuse. Oh and they are also cheap!
Hope this tip is useful to someone else.
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