Romani Progress

At this point in time I should have done 40% of the filet crochet shawl. However, for the second time I have had to rip back my work to correct a mistake. The first time I had to go back 7 rows, which I thought was bad. But yesterday evening just as I was coming to row 46 (the row before the first central motif) I noticed the same mistake 21 rows down. If not for the fact that I'm going to sell the shawl I would have left it and made an adjustment later on.
I now have to force myself to check my work every 3 rows. Keys hope I don't have to take another massive step back otherwise I won't finish this shawl until Christmas.