Ugh. New prop is on the bottom of the lake

This subforum seems pretty dead...

Got our first rc boat a few weeks ago.

Modding is always fun, so an upgraded SS prop was the first upgrade.

Before heading out to the lake this morning, I greased the shaft. I guess I didn't tighten the nut enough because the boat ran for 10 seconds and then it stopped moving but I could hear the motor spinning. No prop/shaft when I picked it up.

So, what's the recommended replacement for the shaft and prop?

I could of course order the stock replacement part, but I'm sure there is a better replacement.

Recs????

Thanks.