I use a gear wrench on the reamer every time I replace the plugs. The first time I replaced the plugs, the new ones wouldn't go in so I used a drill bit. I ordered the 911 reamer and reamed the holes when it arrived. It took out even more carbon. IMO, reaming is a must.

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Brad
1981 300TD - daily driver
1963 Chevy II
2001 F-250 7.3 Power Stroke