If the original opening into the radiator accomodates only a 1/4" pipe or fitting, then to modify this opening to 3/8" would require some driilling, probably with a step drill. If not, then the whole procedure would be useless as putting a 3/8" fitting or pipe over a 1/4" opening defeats the purpose.
I ordered my micro from sysfx and it had no metal pieces or debris of any kind.
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