speedo gear in transfer case

[sixbysix]

Hi!
have a speedo cable that seems to be to small to neatly fit into hole and slot in transfer case gear ... cant get it set so the gear will turn the cable...wont lock in as it ( the cable) seems to be too small ... so am trying to work out what the problem is. I have banjo axles and I believe the gear for the split and banjos are different as is the cable? So maybe I have a split gear in a banjo or the wrong size cable ...anyone know how i can work out what the problem is? Have any measurements I can use to work this out ?
regards
sixbysix