I was told about this Die Nut, pictured here, my mechanic says he use's them all the time and they work fine... but you can only use them once...He asked me to order 16mm Die Nut, cut new threads and I would be fine, has any heard of a Die nut and how good they work...ALso the nut that hold s the flywheel is a 16mm nut. should I use a 16mm die nut or a smaller size because the threads are gone...