If the bolt itself is not stripped due to over tightening try screwing the lock nut in counter clockwise direction usually saws and grinders that spin clockwise and don't seem to tighten when using right tightly lefty loose rule are reverse threaded. Hope this helps!
Hi @plnkdh,
What is the model number of the saw?
由 jayeff 完成的
It’s the 20V CMCS550B
由 Pam 完成的