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You may want to google Brian Leask for his mechanically adjustable WUR. It could be he can modify a Mercedes unit, since they are all similar.
I believe you send in your original WUR, and he modifies it and sends it back within a week.
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Emery
1988 930 coupe - Silver Metallic
TurboKraft 3.3L 8:1 CR, SuperSC Cams, GT35R, B&B Headers, TK intercooler, Tial WG, ARP, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ... 
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