You are still better off with a new pre-formed line. Much cheaper than a cooked tranny due to loss of fluid.
I tried the rubber patch trick and it worked for a while. (Especially, when you break down in west Texas and the nearest thing to MB parts is 5 hours away.) But due to vibration and the location of the repair, the patch did not last long. After two more patch jobs, I finally decided it was futile.
Two hours later,after replacing the line with new clamps and serviced the transmission, it was something I did not have to worry about anymore.
Be sure to replace the clamps to make it last another 20.
