If Bosch had a speck of humanity instead of Teutonic correctness they would put a $.02 nut on each new glow plug & it wouldn't matter if we dropped one ( which I did & had to go to a Honda motorcycle dealership & beg one). Spark plugs come with new top nuts (yes, those things come off, & should be tightened with pliers before installing), shock absorbers come with new top nuts (maybe not Bilstein -- I don't know yet) .........