You guys must be looking at the wrong part or place. I have the reamer, it cost maybe $20 from Phil. As far as using it, you just stick it in the chamber and twist it etc to break up/remove the carbon..which will be burned away in the engine.. It's a good idea, as well as anti-seize to keep them from sticking in the head.

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2004 Ram 2500 Cummins HO
2000 Jetta TDI
1999 E300 (sold)