I don't get many opportunity to work on these jewels so I certainly don't want make any mistakes. The victim/patient is a '58 with thrashed exhaust spigots that an expert welder repaired. I'm cleaning and chasing in preparation for reassembly, and I found a loose helicoil insert for one rocker arm stud and one other loose stud. So?.......does one replace the loose insert w/a helicoil/timesert/keensert ,and "glue"/loctite the other stud back in the head or are more drastic/permanent measures called for? Inquiring minds would like to know. Thank you! TK.