Most did not have a washer. There is a feel that you can get when you start loading the bearing. It is different than when in the free area. The very best way to do it imho is to tighten it just to zero play and drive it for 50 miles or so. Then jack the car up and check the play. Snug as needed. This used to be part of the first oil change and inspection on the 126's when they were new.
As far as vibration is concerned. Be certain that all of the years of rust film on the back of the wheels @ the hub mating surfaces are completely clean before you go checking other stuff. You can take some emory cloth to it. The next thing I would check would be the tires themselves.

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64 European Coupe Brilliant Silver with Red interior 4 Speed Sunroof
87 TDT 286k
87 SDL 195k
83 SD 202k
83 SD 201k
83 D 286k
02 R1150RT 32K
00 122HP FLSTF
07 KTM 250SX

"Danger takes many forms"