NH 1411 Discbine internal cutterbar wear

Hello

 

I am looking at a used NH 1411. The discs outside of the disc with the vertical drive have a lot more play on them then the ones inside of the discs with the vertical drive.  However the knives still have a long way to go before they hit each other. It is the same story on both sides of the cutter bar. The discs on the inside have a minimal amount of play. Is this normal that the wear is uneven? If it is just wear, what is most likely wore out inside the cutter bar and how easy is it to replace?

 

Thanks

-Johannes

NH 1411 Discbine internal cutterbar wear