Firewall platenuts

There are only two nutplates installed on the firewall that is on the engine side of the firewall. One is below the two heater inlets and holds the two brake lines. What is the purpose of the other one located on the right side of the recess. Page 27-5.
Thanks.
Johan

For clamping the cabin heat cables, FF 1-3.

Thanks

aturner said:

For clamping the cabin heat cables, FF 1-3.

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I missed that detail in Fig 3!
Johan