How to change the ”frankenstein” brewhead screw on your
Silvia
Every
Rancilio Silvia owner knows about the problem, with the brew head screw. The
gigantic screw leaves very limited space for dosing ground coffee to the
basket. It is my experience that you can only dose up to 15 g. ground coffee
with the original screw in the brew head.
When
looking around coffee forums all over the world, this issue is the most common
in threads about Silvia. On the basis of that fact, I have made a how to guide
to change the screw.
This was my very first modification to my Silvia. I made
it rather early on because of the constant headache of channeling, because of
the overdose. It is quite easy, even with limited tools and
knowledge/”handiness”.
The purpose of this mod
is, to get the shower screen bolt aligned with the shower screen, to avoid
channeling happening because of the bolt pressing a hole in the puck, when
dosing just a little too much.
So here
goes:
Parts to purchase
usually costs about 3-5$
Counter
sinker, matching the angle of the 5 mm bolt
Remove the
original hex screw. Disassemble the water dispenser and shower screen from the
brew head. At this point you should have these parts at your table:
Shower
screen
Water
dispenser
Hex screw
At this point you are about to countersink the water dispenser. You need
a proper counter sinker with the right angle matching your new bolt. If you can
get to a drill press, that is much easier and accurate, but not at must! If
you only have a vise and simple drill, like most people, this is what to
do.
Put the dispenser in the vise (put it between two pieces of wood, this
way you won’t damage the dispenser), and start countersinking the dispenser. It
is very important that you keep it in a straight angle. As you go on, stop to
check the depth. When the bolt is about 1 mm below the surface you are
done.
Now you need to adapt the shower screen, to the new shape of the
dispenser. This can be done in two ways. First and easiest way is simply
to buckle all the parts back in the brew head. The other more need and gentle way
(preferred), is to press the parts in a vise, adapting them to each other
before assembly. Its easy.
Take a socket wrench top fitting inside
the edges of your new bolt. Do the same Thing on the other side at the dispenser.
This way the bolt Can move freely, the parts can be pressed together to adapt
and shape, to fit each other.
Tighten the vise slowly against the
wrench tops, at this point; the natural shape of the bolt should create a
conical shape in the shower screen. Stop tightening when the surface of the
bolt and the screen are aligned.
Assemble the parts to the brew head and start shooting. You should get
more space between the puck and screen. Giving you larger oppurtunity to dose
up and get better shots with the standart basket.
Enjoy.
Questions Can be asked in the
commentfield or at xiburst@gmail.com
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