late "A" clutch question

I have a '51 "A" that I bought mainly as a parts tractor but now I'm thinking about trying to get it running instead. While trying to free up the sleeve that rides behind the clutch pulley, a piece broke. It is a small piece of cast iron with a hole that rides over an alignment dowel. My '48 model A doesn't have it or any type of alignment dowel. Was it added to the later tractors to take some side load off the toggles? Is there any reason why I shouldn't cut off the rest of the broken part and just run it? It seems to me that if my '48 made it this many years without one there is no reason the "51" shouldn't be able to.

Also, the machined surface inside the pulley is pitted bad enough that it would probably eat up friction disks if I tried to run it the way it is. Would it be advisable to chuck it up in the lathe and make a cut on it to get past the pits or is that a non serviceable part that should just be replaced?
 
your 48 has a pin to hold the collar from turning on the pulley but is kindy of hindin in the collar no you can not run the 51 with out it as to to pits in the pulley just sand blast and run it will be fine
 

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