If your Janome sewing machine is not reversing or only sometimes reversing and is an older model, this is more than likely the fix for it.
There are many models of Janome that use this reversing mechanism.
It's as simple as cleaning and lubricating the reversing parts which is relatively easy.
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Web Site - http://www.institches.co.nz
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https://www.youtube.com/watch?v=tyNltreIg6s