Maybe get some calipers and measure the bar diameter, and clamp diameter. The e lever comes in different diameters and you want to check you've got the right one.
If it's close(ish) and you decide to give it a shot, rather than prize it open try tightening the lever clamp right down. This is a standard way of getting quill stem clamps to flex a bit – making them easier to get on the bars.
Maybe get some calipers and measure the bar diameter, and clamp diameter. The e lever comes in different diameters and you want to check you've got the right one.
If it's close(ish) and you decide to give it a shot, rather than prize it open try tightening the lever clamp right down. This is a standard way of getting quill stem clamps to flex a bit – making them easier to get on the bars.