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I recently acquired a well-used Bogen 3066 head. I am unable to identify the purpose of one of the knobs. It's a rather small, silver-colored knurled metal knob. It doesn't thread in very far, (not far enough to, say, tighten up or lock the elevation motion), nor is it removable as it does not thread all the way out.

The specific knob is ID'd in the pic as D2. Frustratingly, the pic's legend doesn't even have an entry for D2.

enter image description here

( pic lifted from here )

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  • \$\begingroup\$ It looks like F1 is the tilt knob. Could it be that tightening D2 provides drag so that you can tilt slowly and smoothly instead of having it be either tight/locked or loose/floppy? \$\endgroup\$
    – FreeMan
    Commented Apr 11, 2022 at 17:39
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    \$\begingroup\$ This head has a detent that limits the tilt to 45 degrees. I don't see it listed on the parts diagram. Could this be the limit release? \$\endgroup\$
    – BobT
    Commented Apr 11, 2022 at 20:53
  • \$\begingroup\$ I suppose it would provide a kind of ugly scraping drag if it threaded further in. I'm not ruling out that it's damaged (the head is quite well used). But cranking the F1 knob in seems to provide a much more elegant "drag". \$\endgroup\$
    – mike65535
    Commented Apr 13, 2022 at 16:46

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