Here we go again. The AS&CO Sprocket...

[WillWork4Parts]

It is not difficult to just remove the chainring from the swaged but it is quite difficult to remove them cleanly. The drive arm is made with excess material along the spindle hole, the chainring is slid over that material and a machine stamps the excess, swaging the assembly together and forming the lip on the back side of the ring. Reasonably good rings have splines that match up to teeth manufactured into the arm to prevent the ring from spinning in place. The fit is typically quite tight. A skilled machinist with a milling machine can cleanly remove the excess metal and then tap the ring off the arm. If you go at it with a dremel, file, or a grinder, you'll leave big marks all over the back of the ring. One of the rings earlier in this thread shows such marks, but not all of them do.

I believe the ones pictured in this thread that do not have the spline marks are the accessory sprockets shown in the catalog above...the accessory AS&CO was also listed in a later catalog, but not pictured. I still wonder if the factory sprockets installed on 3pc crank arms were machined to have the splines or if that was just a result of being pressed over the crank splines. ... chicken or egg first??

The "Racer" aspect is interesting. I think I laid hands on one years ago and I've seen one other in person, but I never had the liberty of putting one on the stand and inspecting it's S hole... Lol ...and didn't get to check for splines or a different shaped drive pin.
Now that I think about it, it would be easier to grind the round pin to match the square hole of the sprocket. Undated 1pc cranks are probably a lot easier to source than these sprockets.

 

[Schwinny]

I believe the ones pictured in this thread that do not have the spline marks are the accessory sprockets shown in the catalog above...the accessory AS&CO was also listed in a later catalog, but not pictured. I still wonder if the factory sprockets installed on 3pc crank arms were machined to have the splines or if that was just a result of being pressed over the crank splines. ... chicken or egg first??

The "Racer" aspect is interesting. I think I laid hands on one years ago and I've seen one other in person, but I never had the liberty of putting one on the stand and inspecting it's S hole... Lol ...and didn't get to check for splines or a different shaped drive pin.
Now that I think about it, it would be easier to grind the round pin to match the square hole of the sprocket. Undated 1pc cranks are probably a lot easier to source than these sprockets.

Ok. Theory spinning time.
Schwinn had official dealers spaced out in large cities, same as car dealers do.
So what might give an East side dealer an edge over the other dealers in town?
Something a bit more special.

It's something I would have done.
Order a case or two of these rings and put them on all the lightweights on the floor.
Visuals are everything.
Soon you are the areas pre eminent Schwinn Dealer.
Of course when Schwinn finds out they wag their finger but by that time they see your sales numbers and just tell you to cut it out and up-sell the rings. (Which of course doesn't work as well)

....just trying to rationalize all the girls bikes.