Sitting on the seat facing forward, the far left sparkplug was cross-threaded at one point. I have to be very careful, as it doesn't want to come out, and it is even worse trying to get back in. I noticed that when taking it out, there are tiny metal shavings, and I have to be very careful not to get any shavings down in there when removing it. I have tried putting wd40 on the threads, checked and there are no sand particles on the threads, and want to know what I can do, if anything. Is it totally screwed up now, or can I milk it back in with oil on the threads?