Try to blast out (water or compressed air) the grit between the threads along the shock and as much as you can between the perch ring and the strut thread.
Then bench vice, penetrating oil and old cloths to put between the vice teeth and the perch ring.
DO NOT use the bench vice on the actual strut casing, you will damage it and the last thing you want is a warped casing.... only around the ring even then not too tight as to start making it deform, cause that will deform the strut casing underneath also.
With the strut held in place with the vice holding onto the perch ring firmly.... you should be able to acheive some pretty good leverage. Yes... try rotating the whole unit while the vice holds onto the perch.
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