asso b4 diff problems

[sjaakie]

I found it impossible to build the diff on my new b4.
Ive build a t3 and a tc3 so im familiar with asso stuff and they both work perfect.
The problem is you cant screw the bold in enough to compress the sping and tighten the diff .
When you come to the end of the tread the "ears" of the plastic nutholder should be al the way down but it isnt,its far of you can even pull the diff halves apart , the spring isnt compreesd at all.
Im puzzeld ,do you force the bolt in ???What??
Please help