I'm replacing the mid section on my outboard due to heavy corrosion. Yamaha calls it an upper case. The case does separate from the top plate that connects to the power head so it appeared easy until I started trying to get the lower mounts to separate from the case or lower pivot yoke. The yoke had a lock ring and is at the bottom of the splined steering shaft. I can't get it to break free of the shaft and I cannot get the mounts to otherwise come out of the case. The bolt going through the mount can only back out so far before running out of room in the mount area. Any ideas? Could cut and replace the bolts but that has me wondering how I will get it back together.