Nathan-Am only using a washer for seating dies. Bought from local harware store. For rifle/pistol brass am loosening lock ring when adjusting die for amount of sizing on piece of brass. This squares up the actual part of the die that does the sizing with the brass on bottom of cut out in shell holder.
Learned this after finding out the carbide insert in one pistol die was off kilter enough to see the results in pistol brass. As i do not have personal experience with every single press ever manufactured, can not remark on how well they are manufactured.
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