John,
The safest way to undo the screw is put some starter rope down the plug whole to the exhaust port side. Then place a # 20 screw driver into the screw and tap it with a hammer to relieve it. Then you should be able to undo the screw without to much problem.

Regards,
Bruce

Regards,
[Linked Image]

Bruce


Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.