Hi Buckets,
Do you even Google? I did a super quick search on for a parts breakdown for your Stihl FS38. The 3rd link down is a pdf for your model.
Here is the link...
https://www.google.com.au/url?sa=t&...p;usg=AFQjCNEhAF43P3Tt7nLUBgmEZMNqkyU4Qw What did you take apart exactly? When you start the trimmer does it stay on or cut out quickly? Is your trimmer a very new model because it is strange for the trigger to break so soon?
Maybe you didn't push the square end of the flexible drive shaft all the way into the clutch bell housing??? I really don't know, but that'll be my guess for now...
