Apple PowerBook Duo Dock (including Duo Dock Plus) - Manual (Page 33)

Installing a NuBus card in the Duo Dock is a technically challenging
procedure. We recommend that you attempt it only if you are comfortable
working with electronic equipment. You should read all of the following
instructions before you begin. If the procedure sounds like something you
don’t want to do yourself, any Apple-authorized service provider can install a
NuBus card for you.
WARNING To avoid damaging your computer and expansion card, do not
attempt to install any expansion card without first checking the
documentation for that card. If the documentation specifies that an
Apple-certified technician must install the card (usually because the
installation requires special training or tools), consult the service and
support information that came with your computer for instructions on
how to contact an Apple-authorized service provider or Apple for
assistance. If you attempt to install the card yourself, any damage you
may cause to the computer or card will not be covered by the limited
warranty on your computer. If the card is not an Apple-labeled product,
check with an Apple-authorized dealer or service provider to see if you
can install it yourself.
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Installing a NuBus Card