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Post by admin on Jun 13, 2016 8:22:38 GMT
Check if the ring is well put:
1. Be sure the markings on the housing and the rings match together.
For example, check if the left ring is on the left housing.
2. Be sure the 3 tiny black buttons on the casing match with the ► + - markings on the ring.
3. Be sure the edges of the rings cover the edges of the housing on each side.
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