Shuttle Barrel Assembly 13
Step 8: With both front barrel castings still standing upright, join the two halves, sliding
the handle of the top shutter blade through the slot in the top front barrel casting
(6).
Step 9: Starting at the bottom of the castings (closest to the shutters), use four PHMS
screws (5) to fasten the front barrel casting halves together, as shown. Hand
tighten only (25 inch pounds).
Step 10: Turn the front barrel assembly over so that the narrower end is on your work
surface.
Step 11: Install the four shutter springs (14) between the four dimples in the shutter plate
and the tabs in the lip of the casting.
Step 12: Place iris slot cover (5) over the iris slot. Use two screws (11) to secure the cover.
Note:
The ends of the two front barrel castings must be even. Adjust as necessary
before completely tightening the nuts and screws. Failure to do this could interfere
with the barrel rotation.
Note:
Install the springs at the joints in the castings on either of the tabs at the joint. Once
they are installed, the springs at the joints will sit at a slight angle.
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