I've had sucess using a small strip of duct
tape to close the open side of an open-end wrench,
and thereby hold the nut in place while bolts are
The duct tape would take on a "U" shape, attaching to
one jaw of the wrench, the face of the nut, and then
the other side of the jaw of the nut.
When done, pull away the wrench, and don't sweat the
duct tape fragment, as it will become brittle and
fall away from the engine later.
If your wrenches are thicker than your nuts, go get
a set of bicycle cone wrenches - they are very thin.
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