Could any helpful member please provide the outside diameter of a din socket on the rear of Supernait 3 “ although I think the size is universal.
I’ve tried to measure mine but a dissemble of the rack might be necessary.
It’s the very outside size like in the picture. 
These are standard size din sockets; if you’re looking to buy something for diy purposes, you can’t go wrong with anything made by “preh”.
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Thanks it’s just the OD size of the rim I want I’m not building anything. 
Superb and thank you I was everywhere nearly to find this.
Much obliged.