“ From the list of things you’re stripping and rounding out? I’d recommend you guve it to the LBS mechanic.”
Cheers, however have built plenty of bikes over the years with no problems. The pedal thread has completely seized and been unable to remove even in a vice. The threads stripped on the crank when extracting the tool. Other side no problem! The other 20+ cranks I’ve removed on my other bikes over the years have also seen no issues…