Make certain you have read the Buhl Mark IV Opus Opaque Projector manual thoroughly before attempting the Buhl Mark IV Opus Opaque Projector bulb replacement on your Buhl Mark IV Opus Opaque Projector. Without touching the surface of the Buhl Mark IV Opus Opaque Projector lens, remove the lens tube and set it aside. Write down the number from inside the tube's inner lip for the purpose of make, model or serial number for any future need to buy Buhl Mark IV Opus Opaque Projector replacement parts. Your bulb should be sitting just beyond the opening of the Buhl Mark IV Opus Opaque Projector body. Reach in with two fingers and disconnect the Buhl Mark IV Opus Opaque Projector bulb. Reverse these steps to re-assemble your Buhl Mark IV Opus Opaque Projector. This concludes the Buhl Mark IV Opus Opaque Projector review - be sure to read the entire Buhl Mark IV Opus Opaque Projector manual.