AHH! See and here I thought that it was just an extruding block makes sense though...
I REALLY want to get a perfect sized metal replica made, so the picture you provided will help greatly....thanks for showing the screw though! Blind as I was
Actually from what my sources tell me, that top one is NOT the actual prop, but actually Character Options first Sonic Screwdriver which was pretty dead on to the real one, but due to electronics and adding the sound it was made to be larger. The blue tip was added for the black light and the BBC used the ORIGINAL molds for the new prop, not the current toys.