A10 Crank Worn?

[BSAmatt]

Hello,

I'm new here and new to A10s but not new to BSAs having done several A65s. I'm in deep now rebuilding two late A10s at the same time from basket case condition. I have two cranks and they are shown in the attached image.

They both measure up to factory specs on the journals and are in great condition except for the bottom one in the image has what appear to be worn out splines on the drive side. Can someone confirm that is what happened here or do I have two different models of cranks? I have never dealt with a cush drive yet so I don't really understand how it could wear the crank this badly.

Is this crank trash? I emailed Bob Newby to see if this might have enough on it to use his belt drive kit. I really hope I don't need to source another crank as the rest of this one looks great.

Thanks for your replies.

Matt

[muskrat]

G'day Matt. 
Good of you to join us.
The top one looks OK but the bottom one is strange. It's had a bit of  . May have been modified to take an alternator. The main bearing journal looks to have been moded as well. Can you give us an overall pic of the two.
Cheers

[BSAmatt]

Thanks. The good one is stamped 77 on the flywheel and the one in question is stamped 78. Everything else looks the same. You are right, the strange one has a larger chamfer near the bearing surface.

[muskrat]

I don't know about the numbers.
A good engineer shop may be able to weld up and machine the spline back on. $$$$ but finding a good LJ crank would be $$$
Cheers

[route 66]

This is what a worn cush drive looks like.

[RDfella]

AA or police alternator model?