Hello. Found myself a 1952 Airone (Sport) last fall and am keen to get it back on the road by spring. It seems to be in reasonable condition, difficult to tell if it's an older restauration or still original but my guess is it's the former. Anyway, it has a nice patina. But it definitely needs tidying up. Worked a lot on bikes built from the 70's onwards but this is quite different. Interesting though, this thing is quite cleverly put together. One of the things I want to check is the valve clearance. I have manuals but the English version is a bit vague on the subject and from the Italian one I think I am able to deduce it is 0,2 mm for both valves. Am I correct? Something else that's puzzeling me a bit are the screws or bolts that hold the rocker covers in place. They are 10mm hexagons with a sawcut across the middle. The part manual pic is a bit vague but it and some photo's I looked up on the internet seem to suggest this is the correct model screw. Although some pics show allen screws. (were they around yet in 1952?) An allen screw would fit perfectly on the cover since all the holes have a little chamber that would fit the head nicely. The parts manual does not mention any washer but if I use the hexagons only the tips touch the edge of the chamber. That can't be right. It came with spring washers jammed into the chamber holes, which also doesn't seem correct. Can anyone advise me on this? Thanks!