while not an answer from an expert, this is an opinion of a ex-?
Getting the stack of the 12s, 13s, (17s) and 19 back into the a/arm is neseccary, however having a thrust clearance (end play) is needed. I have no ideal how much that should be. (My WAG would be 0.005") Doing a stack of the sleeve 19 (17s) in the upright with thrust washers 15s, making it flush on one end, should have it proud the amount of the clearance can be seen on the other end.
Or just get a bigger hammer to make it fit