The top piece is identical to the 2 bottom pieces, with the exception that it is long enough to replicate the "hat" portion of the first prototype.

Once the ring is pushed inwards, the tabs will hold the ring in place. The tension between the tab pulling the ring backwards and the inability for the tab to move forward due to interference with the lens holder keeps them together.

After the 2 bottom tabs are latched on, the top hat is folded twice to secure the ring.

The tabs are not easy to spot unless you know where to look.
Once the ring is pushed inwards, the tabs will hold the ring in place. The tension between the tab pulling the ring backwards and the inability for the tab to move forward due to interference with the lens holder keeps them together.
After the 2 bottom tabs are latched on, the top hat is folded twice to secure the ring.
The tabs are not easy to spot unless you know where to look.
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