This is how the steering column looks with the steering wheel removed. One obvious implication of
this photo is that the Q/R hub can act as a very good theft deterrent! There are 19 splines on the quick release
mechanism. This is quite a few less than the number of splines on the end of the factory steering
shaft. But this is not a problem. The fine splines on the steering shaft are intended to allow
the steering wheel to be centered, and they still serve this function. The lower number of splines
on the quick release just means that if you put the wheel on "a spline off" then it will be quite
obvious (it will be 19° off-center).
The number of splines has no bearing on the amount of play (or lash) that remains in the quick
release mechanism once the steering wheel is installed. There will always be some small amount
of play with a quick-release hub using a splined coupler.
To eliminate the play completely would imply an interference fit, and that would make it
very difficult to get the steering wheel on and off. But with proper machining the amount of play can be
held to a minimum. On the Terazoom hub there is a very small amount of play, but it also takes
quite a bit of care to line up the steering wheel in order to mount it. If there were any less
play it would be impossible to get the steering wheel back on. To reiterate, the number of splines has nothing
to do with the amount of play. If you need 0.002" (for example) of clearance to allow the steering
wheel to come on and off (in all types of temperatures), then you will have app. 0.002" radial arc of
play, regardless of the number of splines. The only way to reduce this play would be to increase
the diameter of the splined section. That is not feasible within the scope of the Momo steering wheel bolt pattern.
There are some new types of quick release steering hubs coming onto the
market which are designed to work without a splined interface and can yield essentially zero
play when connected. Porsche markets one such device (for the GT-3). It uses a very strange
looking interface but reportedly works quite well, however it is very expensive (close to $1000).
There is also a unique product offered by
Snap Off.
which is TUV approved and quite inexpensive.
This quick release mechanism also offers no play when connected by virtue of its design.