Spark Plugs - Washer
I'm replacing the spark plugs in my Mercury 60HP 2 Stroke.
I'm replacing like for like/the recommended plug:
However, the plugs in the outboard which I'm replacing DO NOT have washers.
The new one's i've just purchases DO have washers.
Do I simply use the washer ones, but adjust the amount of turn after finger tight (1/16 no washer, 1/4 with washer).
Or do I need to take the plugs back and get non washer versions?
Cheers in advance