ProTech 3101 band saw alignment concern

Older saw hadn't been used in 20yrs. Used it to cut PVC sheet (.3" thick) and blade came off. Followed instruction sht to reinstall and adjust blade to middle of drive wheels, but blade guides don't adjust far enough ! It seems blade would need to be on inner edge (vs center) to be in the right place for the blade guides ? Anyone with band saw experience that might offer a suggestion ?