wow everyone thanks so much! I'm only 5'4" but i have very long arms! and a pfaff 7570. I've been using the extension table and trying to do fmq on that is frustrating me to no end b/c the quilt gets caught on it constantly so he's building a quick simple table to drop down the machine to flush. I just didn't know how far to put the machine back from the front. This board is great for info!!!