Pulse Xyleject Operator's Manual page 19

Remove the bent Conical Needle. Secure a new Conical Needle and place it inside the Needle
Retention Nut Base and Needle Retention Nut.
Be sure the O-ring is in place. Then install the Needle Retention Nut
Base and Needle Retention Nut onto the device and tighten
by turning clockwise (orange arrow). You will need to hold on
to the Inlet Valve while tightening the Needle Retention Nut Base.
When you are ready to inject, turn the Needle Retention Nut in a counter-
clockwise direction (red arrow) to expose the tip of the Conical Needle.
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