Just sharing an idea
My mother has had a problem with bird-nest in the underside of the quilt when sewing with her mid arm machine, sometimes she wouldn't catch it right away. Her husband says "if you put a mirror under there you could see if it was ok or not" so out she goes to the general box store and buys 2 cheap behind the door mirrors for $5 each and says they work great. Thought I would pass that along to those who are just learning like mom is.