Guys, look at this. It is really straight forward.
This is a NGK plug with a fixed, NON removable tip. Note there is no hole in the top of the tip and it is darker, coated steel.

Here is removable one. Note the threaded hole in the top of the tip and the removable tip is aluminum.

If your NGK plug does not look like this, you cannot remove the tip !
This is a NGK plug with a fixed, NON removable tip. Note there is no hole in the top of the tip and it is darker, coated steel.

Here is removable one. Note the threaded hole in the top of the tip and the removable tip is aluminum.

If your NGK plug does not look like this, you cannot remove the tip !
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