Mary,
The above bobbin area information regarding the 221 is the same as the 301.
Tell us what 'she' needs. More than likely oil and grease. As far as oil goes, TriFlow is highly recommended instead of Singer oil. TriFlow can be found on the sewclassic.com website or at a bicycle store. Triflow also has a grease for the gears. Use Singer grease for the motor.
As far a oiling goes, the old saying is if it moves oil it.
Grease goes in the gears, oil in all other moving parts. When you oil just use one drop - you don't have to over oil.
Shari