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First off, study the instructions..
C1 C2 C3 C4 C5 C6 C7
The Tread pattern goes |Edge|_Gap_Bump|_Gap_Ridge|_Ridge|_Ridge_Gap|_Bump_Gap_|Edge|
It is very important to remember this pattern.
Sand each piece to make sure the ejector marks are flat, otherwise your Tyre will be ruined.
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Place your parts in order. DO NOT MUDDLE THEM UP.
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Place glue only on the inside of the ring. you dont want glue seeping onto the tread pattern.
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Carefully squeeze together to ensure a tight fit.
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Be careful whilst removing the next end connectors (Part C3)
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Lightly sand with 1000 Grit then brush off the dust
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Part 2
Lay parts out and assemble as previously done, watch out for the Tread pattern and make sure you assemble it correctly.
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You will end up with two parts, One one slice thicker than the other.
Remove and clean up your selected rim.
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place on the thicker piece to the back.
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Add the front piece, making sure to line up with the holes..
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Press together.
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You can leave them unstuck for ease of painting later on...