Dear AVL940T,
Hope you're well. There might still be a corrosion bond between the top of the spring and the underside of the support plate, against the underside of which the spring rests. I'd saturate that area with a penetrating oil (PB Blaster, Kroil), etc. and wait.
You can tap the rim of the support plate, from the underside (the side that faces towards the ground, when the unit is installed). That will drive the plate in the direction that the spring "wants" to expand, so will not reduce tension on the spring compressors.
A sharp rap or two is likely to free the support plate from the top of the coil.
At the risk of laboring the obvious, stand beside the compressed spring when you rap the underside of the support plate. If the spring should be released - extremely unlikely - you do not want to be in front of it or behind it.
Hope this helps.
Yours faithfully,
Spook
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