Hi Keith,
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I take it you want to remove Item 45? Can you post a photograph please? I don't have anywhere near enough information at this point. Just taking a superficial look at the diagram, it looks as if that nut holds the recoil starter together. If it does, why can't you just remove the screws around the perimeter of the plastic cover, and lift off the whole cover and starter assembly, with the nut still holding it all together? That sounds like the conventional way for it to work.

With regard to the replacement ignition module, have you checked the Outdoorking online store? If it isn't listed, you could send a PM to Bruce quoting the part number as well as the model identification, and see if he can help. If he can't, and there is no local supplier, the usual approach is just to buy it from an overseas supplier (being careful to find one with low shipping charges, which usually means one in Hong Kong or Thailand).