Mr. All Thumbs here!

I have decided to replace my 40 bar with a 44 (which is what I have on other bikes) and am attempting to remove/loosen the Sora STI shifters from the bar, with no success.

OK, I have lifted the rubber covering up and have discovered a small silver bolt/screw with a Phillips head, which I have removed - but nothing has loosened.

I have discovered a black slotted apparently screw embedded in the seat side of the shifter which shows through the rubber "hood" area.

SO, what do I need to do.

I knew I should have taken this to my bike shop, but my other road bike is in the shop and I wanted my new bars!

I thought this might be sort of easy. Wrong again.