Hi Mary,
Thanks for reaching out to embroidery.com! I checked the compatibility chart, and it looks like the 5 x 7 hoop should be compatible with your Babylock Venture. So I'm guessing it might be a faulty arm, if it won't fit. I don't see an order for you of the 5 x 7 hoop with us, so did you by chance purchase it from DIME directly? If not, I'd recommend contacting the place you purchased it from originally. Or you could try contacting DIME anyway, at 888-739-0555. They should be able to figure out how to fix it, if there is a way to fix it. (since they're the manufacturer of the hoops) Best of luck, and have a great day!
Mary S.
I bought the Dime Magnetic Hoop 5x7 for my Babylock Venture. The instructions say to use the B Arm. The arm will not fit this hoop. Please help! 6/22/21