~4.5" bolt, 2 nuts, 2 washers, and optional scrap of rubber tubing.
I built one after seeing this thread: http://986forum.com/forums/diy-project-guides/52150-spark-plug-tubes.html
healthservices even made an animation of it in use. For me it has worked flawlessly.
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I am not an attorney, mechanic, or member of the clergy. Following any advice given in my posts is done at your own peril.
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