I don't have a 3021, but can answer some of the questions.
I have a shutter release dangling in my white plastic clip as a matter
of course. The hex opening is for adjusting the tightness of the leg
locks. When the lock is released, the nylon is strong enough to tighten
or loosen the recessed hex heads in the leg lock assemblies. This clip
is not intelligent enough to know which way is up. Consequently, it
doesn't care.
My larger Bogen tripod has two 3/8" threaded holes up at the top. One
has a short bolt with a hole through the head and a split ring through
it to hold one end of a carrying sling. (I think this came with it?) The
second has a 1/4" => 3/8" tripod screw adapter screwed into it and a
spare quick release plate screwed into that. I don't know if that's
exactly what Bogen meant them for (their instruction sheets are near
useless), but that's how I find them quite useful.
Can't help on the center column. Mine is quite different.
Bogen replacement parts are readily available and amazingly reasonable
in price.
Moose
Steve Goss wrote:
>Ok, after years of hearing how good Bogen/Manfrotto tripods are, I found
>a used 3021 while on vacation............
>
>
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