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The 19 mm length version of these inserts were installed in the spark plug holes of a 1992 Honda CB750, secured with JB Weld. The lip on these bears down on the cylinder head and discourages damage from unintentional over-tightening the spark plug. The tapping was challenging in the aluminum, and was eased using a mix of fresh motor oil, dish detergent, and water as cutting oil. Hardware store cutting oil and kerosene let the tap stick more. The cylinder head was off the motorcycle. It would be nice if there was a way to get these to positively engage the tapped hole without having to put adhesive into the picture, and I give them five stars anyhow because these are the only 19 mm "solid," not wire inserts that I found readily available. I think these are an inexpensive, straightforward to install insert.Read full review
Verified purchase: Yes | Condition: New
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