When pulling the stem injection were the center of the bore injection. Use fingertips to block injection tube slowly slowly depress the stem injection tube is back at the center of the bore injection.
Pull the lever on the center of the injection syringe. Use your fingertips to press the stopper rod lever syringe syringe slowly come back to the center of the syringe.
When you pull the lever up the center of the injection syringe. Using fingertips, filling the syringe slowly press stem stem syringe back at the center of the syringe.