I got me a used 606 clutch for kicks and found that the strip just sits there under spring tension, poo poo design.

two squirts of white or black RTV sealant on the edges of the BMS and let it sit overnight (dont start the engine) - otherwise you will see silicon rain on the fan blades which wont come off.

The used one was a toy to see how its built - I cut it up, I did however get a new genuine MB part to replace the old BEHR brand fan clutch which makes the car sound like a dump truck. The new Horton clutch is very good at its job - the fan does go loud but only for a few seconds only.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)