I don't know if this will help or not, but their should be a retainer for those 18 roller bearings. It will be at the very foward most spot in the clutch shaft I found it while thoroughly cleaning the area where the rollers are. It is meant to hold the rollers in place as you install the mainshaft and then slides foward and off the rollers after assembly. Then it just sits there. If any of the rollers are out of place the whole mainshaft will not be in the right spot. This may or may not be your trouble but worth a look.
