Yes. I will wait until I receive another CDI unit that a flying buddy will post to me next week. All things going to plan, that would mean that I could receive it the following week. I will try that one on the engine before tackling the modification and fitting of the magneto ignition.
I've even been thinking that a fully alloy flywheel off another engine might be more suitable to re-bore the taper and keyway to suit the shaft of the Stihl. That way, I would have no doubt about the integrity of the part plastic, part alloy standard one after it has been machined to take a suitable prop hub.
The retaining bolts that would be required to fix the prop hub to this standard one would have to go through plastic. Perhaps a solution to the structural problem, is to fit an alloy clamping disc to the back of the plastic, through which all the bolts would pass.
I'm considering all options.
However, we will try the alternative CDI before anything else.