[Varyon]

Pagan (for some reason it's not letting me quote you)*:

Remainder refers to how much is left over once you've evenly divided as much as you can. The remainder is the numerator (the number on top) of the remaining fraction. In this case, you have an end result of 1 and 2/6, meaning a remainder of 2, so 1d+2. The safety threshold is basically the highest amount of damage where rolling all 6's won't risk damaging the weapon.

*EDIT: I see now that you've deleted your post. I'll leave this up in case someone else has a similar question (original was on why a MinST 8 weapon has a threshold of 8, when 8/6 is 1.333).