Regarding Terry Smythe's questions about the Ampico pump:

First, I think that those spring loaded wooden rods can't be beaten by
anything but precisely machined metal rods with press-fit sealed double
ball bearings.  I only know of these being made for Duo-Art pumps.  I
would not bother with the old pins.  Even if they can be restored they
will likely not fit the old connecting rods.  Why not make a new set and
machine them and the connecting rods to fit each other.  Using stainless
or a drill rod would be my approach.

I don't think you would want anything plated.  This seems to cause all
sorts of problems on precision parts.  I don't think you want them to be
too hard, either, or you risk cracking the cast iron when you install
them, or even later.  If the finish is smooth and you lubricate them
well, they will last forever.  The originals were set like a rivet into
the iron, and this would be risky with the new ones.  I would machine a
tight slip fit and fix them in place with Loc-Tite adhesive.  (Whenever
I do this I put a note inside about the removal of Loctited components.)

The ball bearings should definitely be replaced.  Any bearing shop can
match them.  Most bearings are metric, but a few are being made in
English sizes to replace the ones that were made that way to begin with.
If you are lucky you might be able to fit better bearings into the same
positions.  I would definitely use double sealed bearings which are
permanently lubricated.  If things are a little bent you might consider
double ball bearings of the type that allow angular misalignment.  Some
of those old shafts are pretty soft and don't stay straight even if you
make them perfectly.

Spencer Chase