There's a slight difference between Italian and English (Campy and Shimano, for example) freewheel threading. The difference is so slight that it doesn't matter unless you repeatedly switch English and Italian freewheels onto the same hub. French freewheels will not fit.
Put it on. Remember the freewheel is rock-hard steel, the hub's soft aluminum. Use lots of grease and be especially careful when you engage the first thread. If you start feeling substantial resistance, immediately back the freewheel off with the remover (keep it in the freewheel or at least close at hand) and start over.
Campy hubs were available in all three threadings, in this country the English threaded ones seemed to be the most common. I doubt if Sachs ever made an Italian threaded freewheel. An English threaded Campy hub has a groove machined around the hub between the drive side flange and the shoulder that stops the freewheel. Italian and French Campy hubs do not have the groove.
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