Watson

I've been doing hours of FMQ pebbling on a wall hanging to simulate a stone wall. The top thread is a variegated black to grey and the bobbin is a black to match the backing. I checked carefully to get the tension right when I started that there was no grey showing through and away I went. Well, after many hours, I glanced at the back and it seems that just over the last sewing session the tension has changed and I have grey threads showing on my black backing. I've worked on this piece for almost a year*sigh*.

So, what happened? This machine is newly serviced and I didn't change anything. I just need to know what to watch for so it doesn't happen again.....I've still got hours of pebbling until this wall is done.

Thanks, Watson.

PS...not finished yet...still lots of quilting, some leading and the dragon's eye to do, but here is the wall hanging in progress.....[ATTACH=CONFIG]539176[/ATTACH]