I hold it in place and position it under the foot, sew a zig zag, back stitch and then do a straight stitch, turn it, stitch along the elastic and once I get to where I want the other end of the elastic should be, I turn the diaper to the side, then I pull it as tight as I need to and do a zig zag to the edge and then back stitch and straight stitch. Then I cut the elastic. I dont pre-cut the elastic, I always messed it up that way, so I just leave it full length and then trim.
Interesting! How do you pull it through to the other end?