Hi Captain, and thanks!

Yes, I went ahead and put some set screws on the collar where it goes over the crank. The crank has been converted to right hand threads as you know, and I've never had problems with prop adapters coming loose, but I figured for the few minutes work to add the set screws, the added security was worth it, especially since this engine is double it's original size....

Take care,
AV8TOR