If your gearbox is with Charlie, he will probably be aiming to do it in 3 weeks and it may take Quaife several months to get the tooling out to make some torque biasing differentials. Given that you might want to stick with a gripper if that is the road you were going down.
I think after my original post I got interest from 3 people which was not enough. What really turned me off is I got some questions off line about warrenties, VAT etc - I am a private individual - I cannot get hung up in offering a warrenty. If we order 10, Quaife will make at least 20 and hold 10 in stock and I imagine any purchasers will go for those Quaife direct sold 10 first meaning any private individual without firm orders for 10 who makes an investment of £5,000 plus in buying those 10 is going to be left with that investment sitting on their garage shelf, possibly for some time.
I had a plate style LSD in my Alfa 75 (they all do) and I didn't like it and, personal choice, if it was plate or nothing I'd take nothing but then everyone is different.
I'll gladly send a cheque for the cost of the LSD plus the VAT to the first person who can show me a completed order with Quaife hence I am "still in" in that sense.