Handlebar Clamp size and style

Hi,

I noticed on the handlebar of my Rambler that the centre clamp area is not of uniform diameter.  On the drive side (just right of centre) the clamp are is larger.  I assume this was typical.  However it is difficult to get the bar properly positioned in the stem clamp.  The stem is original but very inflexible to expand to accomodate the bar.  I didn't want to pry it open for fear of snapping it.

So my question is, is the area with the larger diameter supposed to be in/under the clamp or to the right.  SWhen positioned to the right the bar does not seemevenly spaced on either side.

Thanks and take care,

Daryl