I don't see any reason for the square notch, but they all have it. Anybody know why?
If you put them on with the hub key in place on the axle?
Beats me. I don't see it being for key clearance. If the key ever engaged that, you're in trouble.
I thought that it was so you could leave the key in place also. I guess if you key was tight why take it out. Or it was someones idea in the past and to this day they still make them with the slot.
It's to show where the top of the circle goes OR It's supposed to go on the bottom so the grease has a place to get out on the brakes and wheels?
Could it be there was a time savings at the factory? Bud.
My belief was it's intended to slip over the axle with the key in place. It's important to remember that when everything fits correctly, the key doesn't simply fall out like it does on most cars today.
I've often wondered about that too. And as I recall, you can install that cap with the key in the axle, but who would want too? And Steve, next time you post a picture, the least you could do is post a picture of a good cap, or better yet, a 1919 or earlier one!
You're assuming I have a good one.
I do have a couple of the earlier ones, but they're not a lot better.