The only problem I've had with the fiberglass spinner was today and it was my bad. I cut the prop slots too close. The prop was rubbing and chipped the spinner.

Michael,

There is a plywood mounting plate attached inside the spinner about 75% toward the rear of the spinner. I drilled six holes thru the plywood plate that matched the DA100. The plywood is sandwiched between two aluminum plates also drilled with the six holes. The prop is between the rear plate and the crank shaft of the engine.

I thought about making a stainless spinner. Ebay has six quart stainless mixing bowls that look like a perfect shape and diameter (11") for about $5. I was going to sliver solder a 1/16" thick stainless mounting plate inside the mixing bowl.

Better shot of it in the air.