If I understand your question, you need to spread the rim not squeeze it with a rim spreader. I used a hydraulic jack and a block of wood to push the ends apart. If the split is at 12 o'clock, postion the jack and block between 9 and 3 o'clock. I also used this method to make the rim round.

Where Are You From? North of Golden Gate Bridge

Do You own a car built by Durant? 1925 Star