If your stud is 6mm. A 1/4 in thread tap will go in A 6 mm hole and tap out the hole
and use 1/4in bolt or thraeded rod right. I fixed my head and cylinder and barrel.
.I took A bolt about about 2 inches
longer then the stud,i took out put A nut A lock washer A nother nut lock washer
and A flat washer. tightend it to ten foot pounds.then cut the part of the bolt
that was left sticking up in the air.It works just fine