Turning the screw clockwise LEANS the idle mixture. If you do the 95 main jet, and do a plug chop you will know better how much more jet you need. Adjust the idle mix screw to the highest rpm's you can get, and then turn it 1/4 turn counter clockwise. That is the cioorct setting. Once you get that right use the slide stop screw to adjust for the proper idle rpm's. The spot welds may just pop out w/ a chisel, but you would be better off using a dremel tool or a drill to remove most of the weld before trying to bang them out.