Brynn,
You got a deal on that machine, no doubt about it.
We got ours for around $60.ish when you factor in the shipping. It had no cords, no foot controller, was missing the tension parts (like yours), had no cams or attachments other than the foot on it.
We bought the cord set/controller from Sew-Classic and got the local SMG to replace the tension unit for us.
And since then we've picked up quite a few accessories. Even with what it cost us to do that we feel we came out ahead.
Your mother will be thrilled I'll bet.
Joe