Only necessary for models with plastic chassis with a idler wheel holder with more than 8 positions.
This was usually installed from 5. Generation Heng Long (TK 6.0 / 6.0s) ...
The chain tensioner is required for the models from TK7.0.
Predecessor models with a idler wheel holder made of plastic only require the screws from the set.
If you are not sure if you need these set, please call us.
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