Just going to make a guess since mine are all Stihi brand.
See that rectanguler shaped hole in the casting, rotate the head and see if at some point you can see a hole all the way through the shaft.
Mine has a steel rod that goes in to stop the shaft from turning.
Most heads are left hand thread.
See that rectanguler shaped hole in the casting, rotate the head and see if at some point you can see a hole all the way through the shaft.
Mine has a steel rod that goes in to stop the shaft from turning.
Most heads are left hand thread.