blacksoil1234

I have a brand new NX 250, just found out after I filled up the gas, when I close the gas cap, based on the manual, a click sound (only once) should be heard when tightening the cap, but I can't hear any click sound even though I have tried multiple times, but the cap seems already tightened. Is this normal? Should I tighten/try harder (just be afraid if it will break something since it is plastic)? Any help/thoughts please?