Steering wheel stitching repair

[lufbramatt]

Some of the stitching under the top of the steering wheel on my e39 has come apart. Although I like the idea of getting it retrimmed that's a bit expensive at the moment. It's a late sport steering wheel the same as an E46 M3.

Anyone had a go at DIYing this? Looks like waxed polyester thread is the stuff to use?

Any links to diagrams explain the stitch pattern? I think its just a zigzag stitch in the middle I need to replace.