Stupid(?) Momo steering wheel question

["Dean W. Cains" <dwc@xxxxxx>]

Hi Group:

I just pulled the ugly OEM plastic steering wheel off my '87 Spider 
Veloce.  To replace it, I bought a 350mm Momo "Shuttle" wheel, which came 
with a horn button, and thanks to a referral from a fellow Digester, I 
found a genuine Momo hub, too.  So, I've got all Momo parts, and as far as 
I know, these things are all mix-and-match.  All the wheels have the same 
size hole in the center and the same bolt circle, all the horn buttons are 
the same size, and although the hubs are vehicle-specific, the part that 
mates with the wheel is the same from hub to hub.

My stupid question is:  What holds the horn button in place?  The diameter 
of the horn button is the same as the wheel's center hole, so it's a 
not-tight-enough friction fit.  The center hole of the hub is larger than 
the wheel's center hole, so what am I missing?

Thanks in advance for a possible solution.

Regards,

Dean
Lutz, FL
'74 & '87 Spider Veloce's
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