Here is a photo of the shoulder of a shoulder screw. I will not argue the fact that the shoulder IS the weak spot of a shoulder screw. The step DOES however have a radius inside. That radius is a lot bigger than the one at the root of the threads. The shoulder screws do need to be firmly seated against the top of the flywheel or the shoulder becomes a lever and WORSENS the condition.
Ultimately it is up to you what you use and how you do it. I’m just trying to do my best to clarify the reason for the shoulder screws. All that said, I probably would have beat the dogsnot outta the thing by now after hitting the center bolt with an impact. I probably would have broken something by now more than once. I’m not saying that’s right, but I know me. 😯
-Ben
OldJohnnyRude on YouTube