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How does a glow plug reamer work, and can it cause damage?
I'm about to order a glow plug reamer from zdmak.com for my 1982 300D.
How does it work, and shoul you only use it if you suspect carbon buildup (i.e., can it be used as a preventative measure, or does it possible to cause some damage to the threads or anything else when you use it).
Thanks,
Pete.
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