The official Dometic/Seastar parts diagram for the HH5271 is typically found in the section of their service manual (Technical Data Sheet 296225). The diagram will show an exploded view of the helm body.
The HH5271 does not have a dedicated bleed screw. Bleeding is done at the steering cylinder or by using the fill port and slowly turning the wheel lock-to-lock. Seastar Hh5271 Parts Diagram
Warning: Be cautious of third-party diagrams from generic parts sites. Some mislabel components, especially the HH5271 vs. HH5273 (which has a different displacement). The official Dometic/Seastar parts diagram for the HH5271
This section drives the internal piston when the steering wheel is turned. Seastar Hh5271 Parts Diagram
On an official Dometic diagram for HH5271: