Vintage Raleigh Headset Woes

[Skillmister]

Hi all

A while ago I stripped down an old Raleigh Olympus circa 1972 to convert to a fixed gear shop/commuter whip. All pretty successful except somehow in the process of putting it back together and moving house 3 times during that I've managed to lose a couple of bits, namely the Expander Bolt and whatever it should connect to inside (can't say i'm an expert!!)

My main question is, is that a piece that serves a function of holding the bike together or am I safe so long as the locknuts and races(?) are in place? It functions fine as it is so far as I can tell, i'm just slightly worried about whether the handlebars are going to come off as I ride down the promenade

I've found this which albeit not the same bike makes me think i might be missing the equivalents of 6, 20, 21 & 22.. http://sheldonbrown.com/retroraleighs/catalogs/1977-drawings/pages/18-professional.html
http://sheldonbrown.com/retroraleighs/catalogs/1977-drawings/pages/19-professional.html
I don't actually have the tools to take off the locknuts etc at the moment but will try and get my hands on some

Pics:-
How it started life


now

 

[Skillmister]

I'll still note the "don't ride it" part though thanks.

Unfortunately the only bike shop nearby is Halfords, i'll get myself the tools and take it apart to see what I need then do some thorough googling...