Anybody questioning the quality of the 4" spinner that comes with the GR WP 300S. One of the, "so called retired engineers" at our flying field, looked at the spinner and said he would not trust the quality of this spinner, especially the backplate. He added that the backplate may crack when using a gas engine. He said that he would discard this spinner and use only A Tru-Turn or Cermark's brand spinner. Is this bull or a valid statement?

Also, on the BME 50, what is the nut size on the prop shaft. Is it 3/8-24?