open or closed

A contractor from Greenwood SC says:
How do i know if I have an open or closed shoe cam? Ref 1 1/4" T-lock balance
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Tom from SWISCO responded:

In an open cam you can see all the way through the shoe, whereas a closed cam does not allow this. I have included pictures for clarification. The first picture shows an open cam and the second shows a closed cam

Dimensions for 15-195B
Dimensions for 15-195B

Dimensions for 15-229
Dimensions for 15-229

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