Oh they are easy to break! After 5 or 6 normal and gentle "trys" after all you just had it off 15 min. ago on the last tank, no prob. Well I'll screw this F***ER ON NOW! ........ all done. Go directly to dealer. Just don't see the need for a 7 or 8 pc. gas/oil cap. I think, no I know that the cap(s) on my very old and Stihll in use 041 have never been replaced.