It's a very high quality piece and the gears are high quality billet steel.
The idler gear is stout with a precision ball bearing and a strong attachment to the backplate.
It's not going anywhere.
I hear the term "engine harmonics" used frequently whenever someone says "gear drive" but ironically I have never seen anything to support the claim they are of any detriment.
geardrives have been used in some of the most powerful aircraft piston engines and are used in a lot of extreme duty diesels too with high reliability. I'm talking everything from light truck diesels all the way to locomotives.
