where to get rubber damping pads

Silly question I know - but where could I order peel and stick damping pads for vibration isolation of my gyros?

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impact of motor-to-motor distance of a quad

I'm designing my own quad and wonder if there is a rule of thumb for how far apart the the blades should be for a quad?

Let me guess, the minimum distance should be to avoid the props from colliding. :-)

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