I might have a stock S2 diff you can borrow. Will check tonight.
I would just tell the guy you got the diff reconditioned and it clunks because it is yet to wear in, at least that is what the diff place told you....
If members (that is you guys), can't play nice, be civilized and present the club in a positive light that is what happens.
Committee are discussing the issues and I would hope for a consensus by the time of the November Gen Meeting.