Thanks Grumpy mate,
did you get the manual and have a look or do you know the lawn boy motor ?
you can kick me if you like but i undid the magneto/coil and this time pulled the screw completly out and now i see there is an oval shaped hole in the piece the screw goes through first which i couldnt see before because the screw head was covering it, so you are right there is room for a little bit of adjustment for the coil away from the flywheel. so hopefully no more scoring at least.
going to pull the flywheel etc off and have a look. couldnt do it before my mother dropped in still driving at 80 years old not bad ahh