Review on BIG SERT M14X1 25X16 8Mm INSERT QTY 51407 by Jim Ball

Glad I found it! My wife's 2004 Mini Cooper S knocked the spark plug out of cylinder 1 and I tried using the stock re-thread kit but it only took about 3 days and knocked it again! So I had to spend 2k on a new head (because it's a JCW version) or get it with the Big Sert rethread kit. It's been a few months now and it seems to be holding up! Hope it lasts! I would recommend taking a small car vacuum and a small clear plastic tube to remove metal shavings. Be careful! Also leave the spark plug on and cycle the ignition on a couple of times to try to blow out any remaining chips. Vacuum again. Be sure to let it dry for 24 hours to ensure the threadlocker is fully cured!