Stack height - I've heard this mentioned many times and not really understood it's meaning - it's simply the total height of all the various bits that make up the top part of a headset?
I've just put the forks back in and measured the length of the steerer that is showing out of the top of the headtube - 27mm. This is with the bottom cup in place as the bugger is well and truly stuck! That bit might have to stay and i'll remove the black paint and try and make it look the part.
Pockets are a bit empty until next weekend but I don't mind paying if it's in good condition - NOS is unlikely as everything else will be used although nicely polished.
Hoping to do all parts with period Campag, issue is finding a 70's one that is in decent condition. The fall-back will be Tange perhaps if that was a commonly used part. I don't think this frame could warrant an EDCO - I'm already at £370 and I reckon there's another £250 to go to get it as I have it in my minds eye (famous last words)
Current headset is YST which looks like it's off a BMX and comes with a not-so complimentary rubber hood - it's bloody horrendous!
Didn't realise Italian was so similar - does that apply to BB's as wll then?
Cheers, brilliant advice & information as usual

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Rick Powell 753 Track / Ribble Gran Fondo / Colnago Asso / 1975 Harry Quinn TT / 1990 Concorde Prelude / Vitus 992 / Keith Coppell Lo-Pro / 1986 KAS Vitus 979 / 1995 Mercian Strada Speciale / 2011 Raleigh GAC Militis 3 ex Graham Briggs / 1995 Ribble 7005 / 1986 Alan Super Record / 1985 MK1 Vitus 979 /
On the bench: Sirius 853 TT / Sun Solo Chrome / Ciocc Designer 84 / Giant TCR0 Pro Compact / Ribble 653 Tourer / Daccordi Lo-Pro / Look KG96 / Bottecchia Equipe / Look KG231 Credit Agricole / Contini Grand Prix / Aende Lo-Pro / TVT / Langdale 653 Pursuit /