I wasn't doubting you, I just wanted others to know BRS was wrong. I asked them to confirm with Tunze what they are recommending, so hopefully it gets fixed.BRS is wrong, the above posts and BRS are confused between the regular Streams 6105, 6085, etc, which you would only upgrade the outer magnet to 6205.501 for 3/4" hold and Stream 3 which uses two sets of the same magnets used on Nano Streams, these can only be upgraded to 3/4" by 2 pairs of 6025.500. This is what I do day and and day out for 16 years, I am 100% certain I am correct.