Locking Diff

[ginge]

Hi I have a yokomo mr4tc. Which came with a one way front diff.
I fitted a ball diff in the front but a crashed and broke the bit where the drive shaft goes in.
I then looked for a spool, thought I found one but when I fitted it, It was too big. Must be for the new mr4tc bd.

So I would like to no if you can lock a one way diff. ??
As that is all what I have left and as it metal it should stand a crash

Any help. Thanks