Replacement U-8918-P3 Wedge Bushing and U-8385 Wedge Screw. For spotlights with flat shaft. Used to secure handle to the shaft of a spotlight. Should be paired with U-8918-P3 Wedge Bushing and U-8385 Wedge Screw. Genuine Unity Spotlight parts. Wedge bushing replaces old part number U-8384-P Unity Spotlight Parts Screw and Bushing Kit U-8384-P Wedge Bushing and U-8385 Wedge Screw (For Spotlight with Flat) Step 3: Replacing Handle with Flat Wedge (Fig. 2)A) Look for Flat on Int. Tube, and take a mental note of its location.B) Gently slide the new handle assembly onto spotlight shaft while turning Grip to engage Gear Key with Rod Slot, and rotating handle assembly to engage Handle Housing Key with Outer Tube Notch.C) Rotate handle assembly to the position, where Flat on Wedge can engage with Flat on Int. Tube, to prepare for Wedge installation.D) Insert Wedge into handle housing with Flat on Wedge in alignment with Flat on Int. Tube, and wiggle handle assembly slightly about shaft while pushing Wedge with your thumb to engage Flat on Wedge with Flat on Int. Tube.E) Once Wedge is in place with the flats engaged, insert Wedge Screw and tighten it to 40 5 in-lbs.F) Connect Lead Wire(s) to power supply.