I think some cushion is needed for recumbent lowercase to ride in the town.
So I made it.
At first, two Velcro strap were made.
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Then, a piece of cloth was prepared to cover cushion.
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The two Velcro belts were attached the cloth.
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Next, a fastener were attached and sewed around.
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I cut cushion and pushed in the cover. Then it was attached the seat.
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Side view.
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back side
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Then, checked total balance.
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From now, I go out by this bike and I check the cushion.
So I made it.
At first, two Velcro strap were made.

Then, a piece of cloth was prepared to cover cushion.
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The two Velcro belts were attached the cloth.
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Next, a fastener were attached and sewed around.
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I cut cushion and pushed in the cover. Then it was attached the seat.
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Side view.
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back side
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Then, checked total balance.
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From now, I go out by this bike and I check the cushion.