John,
A power starter is a great help with 1/2A engines. The NorVels and BigMigs all - I think - have a steel washer to prevent the prop drive washer from galling on the case. Cox engines didn't. This is an important thing!
Still, it may be best to just 'bump' the prop with the starter cone, not try to drive it until it lights. The most important thing shoudl be getting enough RPM to light off.
Luck!