I took my machine to the LQS where I purchased it because it wasn't working right.
Now the repairman there isn't known for having an easy-going personality. He's very rigid, business like, and has cost the store some customers because of his sternness.
I didn't know any of this beforehand, so when he told me I didn't have the machine threaded correctly and when I challenged his opinion, well it wasn't pretty what happened between us. I got indignant, questioned how my making such a simple mistake could cause problems with the machine.
The more unbelieving I became, the angrier he got. I went silent, packed up my stuff, the assistant manager came out, I was flustered and had to leave the store as I was saying "Never mind!" and left the repairman flapping his arms in frustration, I swear.
We've become friends since then.
The moral of the story is: make sure the upper thread is threaded correctly. Saves a lot of angst :oops: