Yep, mine's just gone similarlty... was going to get it fixed, but then decided to hang on until spring so I can lube it up ready for summer.
You probably need two new runners, which are £80 each, but I believe a monkey could fit them.
Otherwise, it's a new motor unit, which is about £125.
Failing that, just live with it tilting... that's what I'll be doing for 6 months!