French Knots?

I'm not sure if this fella is taking longer than my other blocks, or if it's just that I've had less time for stitching this week. The lobster has a lot of intricate little jagged bits and, for that spring of whatever it is he's holding in his claw, I think I'm going to have to remember how to do French knots.

I've done them before, back in the days when I was obsessed with cross stitch landscapes, but they were never a huge success. Any tips?