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The Correct and Incorrect Keepons To Choose

In the photo below, two imaginary styles of Keepons are pictured.

The style on the left has a fully-stretched threading hole diameter bigger than the eyeglass temple tip diameter. Good.

When unstretched, the threading hole diameter is smaller than the eyeglass temple bend diameter. Good.

This style will fit.


The style on the right has a fully-stretched threading hole diameter bigger than the eyeglass temple tip diameter. Good.

When unstretched, the unstretched threading hole diameter is not smaller than eyeglass temple bend diameter. Bad.

This style will not fit.

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