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Can't speak for the front one, but on my '04 RS, the rear-most one on the right side of the tank got cross-threaded sometime along the way...
No fuel leak, and I believe that would be true for the rest of them - otherwise they'd all eventually leak.
I tried using a bottom tap (a tap with a flat bottom instead of tapered), but the threads were so short I couldn't chase them.
Side note - on my present RT, the same right rear nut is showing signs of age; I have to use the shortest possible screw there. Grrr.
I find a punch with almost the diameter of the bolt and make sure that the tank is aligned exactly with the hole before trying the bolt. Then HAND tighten the bolt before applying socket or wrench. But I agree - anxiety inducing time.