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@Mr_Bump
English threaded freewheels (Oft marked A1 on the biggest sprocket) will fit Italian threaded hubs but whence you've done it, it might be tricky going back and forth to an Italian threaded freewheel as you'll be changing the angle of the threads each time.
Personally I slap copper grease on the threads, no way will it ever stick come rain or shine & might help getting the interchangeability, personally I'd stick to one type & be done.
I've no longer any close ratio freewheels (I had a boxful of NOS regina Corsa's I gave away for a tenner each some years back) so the best I could offer now is a good order mid range Suntour 13-24 6 speed.
You might want to pop over onto Retrobike, they'll be loads of offerings I would think.
Actually here's A dura ace going for not much in Hungary £13 + about £8 post
http://www.ebay.co.uk/itm/Shimano-Dura-Ace-FA-110-First-Generation-6speed-Freewheel-13-21-Japan-Cog-/151072601875?pt=LH_DefaultDomain_0&hash=item232ca0f713#ht_1333wt_1394