Clamshell alignment

[Geof3]

So, I’ve searched this and can’t quite figure out the exact way to adjust this. My clamshell sits “off” a bit to the right (pass) side. The trim gap is smaller on the right than the left. I’ve read Mike F’s page and understand the height adjustments, but I can’t figure out how to adjust it left to right and vice versa. Top raises and lowers fine, and the clamshell is flush height wise. It’s as though it needs to be tweaked to the left a few MM. Any help would be appreciated.