Used the same technique as Matt, but with a 1/8" MPT X barb brass fitting. Can't remember if barb was 1/4" or 3/8" but easy to figure out with it in your hand. Held great until radiator replaced for other reasons (~1.5 yrs.).

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)