Noland Adams goes into good detail re 63-67 jacks on page 103-105 in Vol 2 Resto/Tech guide. When referencing thrust washer bearing arrangements, washers are referred to as "large flat washers" with no mention of diameter in relationship to the acetal resin bearing between the washers. I have what appear to be two original 1966 jacks which are identical except for the diameter of the bearing washers. Both resin bearings are the same diameter while the washers on the first are 1 1/8 and the second is 1 3/8. I know this is nit picking but it is facinating. Anyone know if washer sizes were constant or varied?