City Theatrical Follow Spot Yoke
4
Preparing Your Lighting Fixture
If you are planning to use a 14º-50º or a 10º Source Four, you will need to remove the
shutters from the lighting fixture. This is not necessary, but may be desirable for a 5º Source
Four to prevent the shutter blades from accidentally being moved during operation. Remove
the shutters by removing the four machine screws which hold the two halves of the Source
Four barrel together and exposing the shutter, pressure plate, and shutter spring parts.
Remove the shutter blades, but reinstall the pressure plates and springs. Only reinstall the
two machine screws on the neck of the barrel. Then go on the next step:
Two Angle Brackets allow your Source Four to be installed in the Follow Spot Yoke Source
Four LED. Replace the two ETC Torx machine screws with the enclosed M4x12 pan head
Phillips machine screws. Then use the original hex bolt and washer to fasten the angle
bracket.
Next, install the two Tee Slot Extrusions using the enclosed #8-
32 x 3/8” flat head Phillips
machine screws (three screws per extrusion) as shown in the illustration below.
Note:
If you experience difficultly installing M4x12 screws, it may be due to incompletely
threaded holes on the Source Four barrel. Threads can be formed completely with the
following steps:
1. Remove the bottom half of the barrel, locate the threaded holes in the barrel.
2. Using the original Torx thread-forming screw to finish the thread on the bottom half of
the barrel.
Angle Bracket
Tee Slot
Extrusion
#8-32 x 3/8 Flat Head
Machine Screws
M4x12 screws
Original Hex Bolt
and Washer
