I've always cut a little 1" section of the braided return line and stuffed an oversized ball bearing in there. It's not a high pressure line, so just like a nail or screw, the bearing won't shoot out. They get replaced about every year anyway, I don't want to spend more money on an item that should not cost anything more than a couple cents.

Phil Forrest

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1972 220D "Trudy," named by a friend.

"The 220D sounds good... I suspect it is the only car that you need a calendar for, rather than a stopwatch, when doing acceleration tests."
Tom Abrahamsson