Pedal insert LED lights for Gotway unicycle

This is a case to accomodate one battery, 3 leds and a mercury switch.

Its size allows it to be inserted within a Gotway MCM2 and MCM3 ( but not MSuper or MCM4 ) unicycle pedal and provide a way to be seen by other people while riding your wheel (See video and picture).

Depending on the leds used, you will obtain various effects.
Here is a video showing two options:
https://www.youtube.com/watch?v=GVOQImmvStY&feature=youtu.be
They automatically switch on when you unfold the pedal:
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