I recently pulled my alpa 1 stern drive for a Mercruiser V8 5.7 260HP I/O to change ex. bellows. The screw that goes thru the shift lever at the top is damaged where the flat tip screwdriver inserts. Already tried an impact driver with no luck. Any suggestions? I'm willing to replace any parts necessary if I can cut something to get it out. s/n on outdrive is 0C505901.