I will never use a spinner with a plastick backplate ever again. The only two plastick back plates I have ever sed BOTH came from CPro and both have exploded. This was not because I don't know how to bolt on a spinner.

I checked the spinner that came off the p-40 and the plastick is brittle and after inspecting the plastick found it to be full of small bubbles let behind after the injection prosess. This im sure has nothing to due with it comeing apart. On the other p-40 I also have has never seen the air yet and was very glad I inspected the spinner before flight. This was found to have several cracks and bubbles on the OUTER edge.
This has never bee bolted to the engine, So instulation is not the cause of this being junk.

I will remember to throw away all the plastick spinners that come with all the CMPro planes that I buy in the future. The planes fly great and Iove the CMPro product. I would like to see them step up and start makeing spinners with aluminum back plates like the other compaies out there.