Seems to me an easier and safer solution to fabricating a replacement copy
of the OEM ball joint is to find an existing ball joint that matches the
steering knuckle taper and adapt it to mount in the roadster A-arms. One
would need to find an existing screw mount ball joint and then make a
V-bracket with a threaded center hole to mount the substitute ball joint.
The V-brckets would have to be different for the upper and lower ball
joints, might want to just create a lower ball joint replacement first since
these seem to wear the most. BTW I am very leary of the ball-air sysem
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