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Electronic Theatre Controls Inc

Source Four Barrel Screws Changes Through Time

Pertains to the 19°,26°,36° and 50° Lens Tubes:

In 1996, ETC was using for the S4 Lens Tube:  

4x HW391 --- Screw, 8-32 x 3/4 phPHMS B/Z
8x 7060A4012 --- Lens Pad Support
6x 7060A4009 --- Bushing Guides

Around 1997, ETC started using for the S4 Lens Tube:

4x HW369 --- Screw, 8-32 x 5/8 PhPHMS BO
10x 7060A4012 --- Lens Pad Support
8x 7060A4009 --- Bushing Guides

Around 2006, ETC started using for the S4 Lens Tube:

4x HW3154 --- Screw, 8-32 x 5/8 PhPHMS BO Taptit B/Z Waxed
10x 7060A4012 --- Lens Pad Support
8x 7060A4009 --- Bushing Guides

The HW369 is a machine screw and required a nut for assembly.

The HW3154 is a thread forming screw that threads into the casting so no nut is needed. If the S4 had the HW369 screw + nut, then those need to be used for replacing, because the screw hole in the tube would be too large for the current HW3154 screw.

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