I'm not familiar with a 7110 but I'll make these comments.
When you thread the machine make sure the presser foot is all the way up, and that you get the thread all the way down between the tension disks.
You might have to hold the thread between the spool and the disks to get enough pressure on the thread to get fully down between them.
I have quite a few feet that wobble on the ankles. When they get too bad I toss them and buy new ones.
Joe