Well - since I have been just uploading a bunch of photos of late perhaps some explanations of progress are in order:
So here we go - The diff build is consuming a mammoth amount of time - to get from raw billets to the drive stack seen in the photos has taken 4 months of sparodic effort and a machine shop with enough kit to make your eyes water - do not try this at home! Unfortunately I lost the shots of the raw material stage...
So we stareted with a Toyota Celica Torsen diff - machined the ring gear mounting circle down and sliced off one bearing snout - then took the drive outboard with a couple of big billets of 1045 steel. The drive side bearing runs on these held in an eccentric mount on the side plates - the alloy bits below are the start of the eccentrics - and on the right a hairy arm and teh eccentric in place - 0.300 or 7.8mm of tensioning for the chain
Diff 
Inital stack
Final stack eccentric is the lighter colured piece
All pretty simple really - I will take some detail shots of the whole exploded unit prior to final assembly!
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