I take it you know how to modify a pipe cutting tool to take the knock out of the ferrules by very gently re compressing the female don't you?
You just replace the blade in a small pipe cutter with a bearing, fit it over the female ( male not fitted ) and roll it around tightening gently, keep test fitting and adjusting. It only takes a few minutes and does a great job and keeps the ferules as original.
Sorry if this is telling you how to suck eggs...
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