They left off the metal end that screws on one of them because their packaging was so bad it fell out in transit! Can I just use the one off my old 3924? The 3923 has a hole in the metal piece and the 3924 doesn't..will that hurt anything?? 
I bought 3923 spark plugs from amazon (1 plug cooler) but problem HELP!?
- Thread starter Pokageek
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