Top mast backstay attachment


Good day Amelians
Has anybody run the adventure to take apart the 14x150 mm SS axel from the top of the main mast where the back stay fitting is attached ?  I foud it well "welded" to the aluminum support and after several days of corrosionX , plastic hammer and drill in Hammer mode , it does not moves at all. Back stay and Maroquin are taken apart and their fittings that stay on the mast mouves freely now .  Next step , heat and the previus steps.
Any tip could help and would be greatly apreciated. Thank you in advance.

S/V Sunny Side
Maramu #219
At Todomar Yard Cartagena

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