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Does it have to be on a particularly flat surface or a bit of a curve is OK?
Stevethejambo, is that why you put yours a little bit high?
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It actually comes with a spacer to allow for the curve. I put mine on a little bit high by accident, so it could definitely go lower, although it will make it a little bit more difficult to change the disc when its due.
Its definitely quite a nice product though, just wish they did the personalisation when I bought mine!