.... How was Bor able to stop and hold on to Thor's hammer? Was it because his power was greater or equal to Odin's? From what Odin said about Bor in #7 about how Bor in his rage, went down to earth and cause the mortal race, every suffering, every pain and every curse within his power to bring just to show Odin who was boss, Bor clearly isn't worthy to lift up the hammer , being as cruel and vengeful as he is so the only explaination has to be anyone who can equal or exceed the Odinpower, can lift up Mjolnir. I remember Zeus in the past also been able to stop and hold on to Mjolnir.
Two of the Enchanters have done so, and they were individually inferior to Odin. The power required to bypass the worthiness/return enchantment is probably somewhere in the Hela to Dormammu range.