Hello Miriam (see, I remembered to add the O this time) - plenty of work ahead getting that muck off the Pfaff! The needle threader is handy if it works...
SunlitenSmiles - it is definitely not nail varnish. I have a manual for this machine (a treasure in itself) which I bought separately. It refers to the oil holes being marked in red, so in four words they dispense with the need for a diagram. Also, it's surprising how many people assume that a machine with a name ending in A was made in Italy.
Today's photo shows the shuttle. It is a transverse shuttle machine. To remove the bobbin you have to turn the wheel to make sure that the bobbin is in position on the left of the needle, then pull the slide plate back and the shuttle automatically ejects. The Germans continued to make transverse shuttle machines right up until the Second World War, even though the design pre-dates the vibrating shuttle. Transverse shuttles make an excellent stitch - I love them.