I wasn't really having a whine, just a bit of a tear. I'm OK now. I've come good.
Yes!! the rotation of the wheel tends to push the speedo drive forward, and the pushed on sleeve/spacer next to the driven gear, regulates the amount of endfloat in the assembly. I can see that now. My hub gear is pressed on the same as in your picture with a slight protrusion. I have another hub, that I am restoring, and its gear appears to be cast with the hub, not a separate peice. Anyway, Whilst I have the wheel out, I would like to apply some type of non drying putty or similar to the hub gear section, assemble the hub and the brake plate, then slide in the speedo drive, to determine the location on the hub gear where it drives the speedo gear. I think my speedo drive assembly sits too far in, although, as I said, it has always worked OK. (if it aint broke??)
Interesting comments regarding why speedo needle waves around over 50 miles per hour. I'll have to investigate lubrication issues, wear in the speedo bearings, cable whip ect. My cable does slop around a bit inside its casing. The cable inner, does spin quite fast. Its geared up 8:20 ratio with the wheel I think. I grease my cables with common high temp, water resitant bearing grease?????
I have my speedo's restored outside, so I have never had one apart myself. I think these stuart warner's have a crimped on outer rim, preventing people like myself accessing the internals, and playing around with what I don't understand. Unfortunately, I'll just have to pull the speedo out, and have a look. May-be sent it away again, to more knowledgable people.
On my new 45 flathead resto, the restored speedo odometer has registered 84 miles, and the trip has registered only 73 miles. Not sure whats going on there either.I definately want to know when 500 miles is up, for its due oil change ect.
Thanks for all your comments, it has been very helpful