Juki LZ2281N industrial sewing machine. The Needle Rod is damaged....the threads where the needle screw fits have been damaged by accidently straight stitching while the zigzag width stitch was not on the 0 position. I am waiting for delivery of new Needle Rod and Needle Screw parts. Can someone help me to change the parts as the technician in my area has no experience with this machine. Do I remove the Balance Cover on the side of machine to reach the Needle Rod.....should I attempt to do this as there might be other complications?

Sewing Machines - Juki