My dad and I are having a heck of a time getting good access to the screw on the distributor clamp. A short screw driver doesn't give us the room to turn it, and longer ones don't get a good angle because of the pan draft tube. Do you have to remove the draft tube in order to get at the dist clamp screw? If so, how does it come off? Maybe there is an easier way? Also, the screw on our clamp looks like it has been worked over pretty good with a screw driver that was too small--the slot isn't very straight any more. Is there a good place to get a new replacement screw? Thanks in advance.