I still can't see crawling under with a flashlight. I do a block, or part of the border on one of the edges, then release the tension on the belly bar and unroll the quilt a bit so I can flip the edge over & take a look. If the tension is OK, I don't look again. I will say that I usually do all the same kind of quilt (quilting cotton tops and backings, w&N or w&W batting) and use the same brand of thread in top and bobbin, so I don't usually have any issues.