Ive noticed a difference between my dads bench, and my friends bench. On my friends bench, the stands that hold the bar are further apart, so they hold the bar closer to the ends. On my dads bench, these stands are narrower. What is the reason for that? I would think the bench with the wider stands would be more stable. My first thougth was my dads bench was made for a standard bar, and not an olympic, but he has been using an olympic bar on it since he's had it with no problems. Any ideas?