Minor factoid - both the Colnago (Campy horz) and the Caylor (Campy vert) have old Campy SR (82, 84) no B-screw dr's on them. They have each had a wide variety of freewheels on them over the years and have never suffered any sort of shifting woes even tho bereft of dropout screws and the axle all the way back.
And BTW the Caylor does have the washer brazed to the inside on the Campy vert.
have a nice day
Charlie