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Improvements can be made to the sim, i think i should have a virtual wall fixture where the bolt head would be, that would probably improve the accuracy. Anytime a stress goes over 10^8 in the sim i dont really trust it. The virtual wall on the back of the part isnt really doing anything except in the special cases.
I also guessed the size of the Fz contact area, but will redo once i have confirmation or a better estimate. -MP