Stuck motor mount nut - Can't align

[OpenYourWallet]

1996 Bayliner, 5.7 w/ Alpha 1 Gen II

Installed my new engine recently. Went to align it and my front port side front engine mount, the lower nut is seized to the bolt. It started to turn the motor mount bolt when I tried to adjust it. Any tips on how to unfreeze it? I PB blasted the crap out of it, but there is no flat on the bolt to hold on to in order to apply leverage against the nut. Should I just buy a new motor mount? Tips appreciated.

 

[Scott Danforth]

cut off the adjuster stud top and bottom, replace the mount

 

[tpenfield]

+ 1 to the above. Once the mounts become rusted to the point where you cannot get a wrench on them, they aren't much good.