This is extremely common.

I have had pretty good success with ammonia. I work on industrial refrigeration, so the stuff I get is diluted anhydrous ammonia.

Parsons, Mr.Clean, store brands will all work, look for the highest concentration of ammonia.

Grab some grease and carefully paint a light layer on the areas you don't want to get discolored. Keeping clear of the bolt area. Continue to soak the area where the studs are stuck.

Honestly, I use a plastic tub used for mixing mortar (about$25 at the home center) and a little aquarium pump (like $8 on Amazon) and put the hose right over the flange.

It will take a day or two, but the ammonia will eat up the aluminum oxide, but really won't hurt the good aluminum, just makes it flat and raw looking, it should polish back.

Good ventilation, slow and steady.


GT

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I just had to do this a few days ago. I soaked the studs with PB then I used heat and a hard rubber hammer on it.  Worked on one side but the other side I used a cut off wheel where the studs were and then punched out the rest

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Whatever u do, don't beat on them to hard. I was using a rubber dead blow and cracked the whole flange off the snail. I know what ur going through, wish I woulda had all this good advice.


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